If he actually builds an exchange then I will definitely use it. Even now I use some exchanges just for trading and buying and selling, of course I move everything from the exchange immediately after these tasks are finished.

But the hardware thing is different. Although I trust Satoshi Nakamoto, I would never trust his distributors which is why even if it were the most secure hardware wallet in the world I still wouldn't buy or use it. I trust the seed phrase generated by my own device a lot I don't need a hardware wallet.

I think we are getting it wrong. Centralised exchanges are not the only types of exchanges available. If Satoshi were to create an exchange, for instance, I would expect it to be decentralised and built around blockchain technology, allowing people to trade cryptocurrencies transparently without relying on a central authority. But then, don't think it makes much sense to assume that Satoshi would create an exchange, as his main focus was Bitcoin. I would be more interested in seeing a wallet designed by him, although we already have many secure wallets available today.

Let's not mistake Satoshi for a perfect designer. Even if he created a wallet, it could still have flaws and security vulnerabilities. I think OP is imagining a wallet that is completely safe from hacks and attacks, but no wallet can guarantee that level of security.

I will not use it. Bitcoin was built for decentralization, which is the reason.
If Satoshi created a hard wallet that is high-security and open source I will use it, and it will be the most trusted wallet.
If he builds an exchange that doesn't align with the main reason why Bitcoin was developed. I will take it that someone has accessed Satoshi's wallet and it isn't the real Satoshi. There are a lot of ifs, though, because nothing of this manner will happen.

But how would we know it was the real Satoshi? How would you know to place trust in that.
If Satoshi for example moved coins in the related wallets would that be enough proof that
it was real? would you be wondering if someone else got hold of the wallet? what happened
if it was the real Satoshi and something happened and he* and you couldnt access the platform
where your coins were stored?

The best scenario is to take control of them yourself, that way if done as best you can - YOU
have control of them.

The real Satoshi would not endorse such a move. The general consensus is to not leave them
ONLINE and to take control of your funds.

Its up to everyone to try and find the best anonymous way of doing that. There are other ways
to create a wallet without using a hardware wallet, something I have not done myself.

Why is no one talking about Bitcoin Core, which was originally developed by Satoshi himself? So technically, Satoshi did create his own wallet. When it comes to an exchange, he would have never done that probably because his intention wasn't to make money out of all this, if that was his intention, he wouldn't abandon his coins like that and leave or stay anonymous forever, because if he was someone who would be hungry for money and fame, he would create the project, take every credit for it, earn a lot of money from it, and then eventually retire as per his wish.

Now, if we talk about the safety of our assets when using wallets and exchanges, I personally think that if a person wants, they can always use ways to keep their assets that would keep them safe from such attacks. We can take the coldcard attack as an example. Even if the attackers managed to find a vulnerability in the software and used it to steal the funds, any user who had a passphrase with their wallet would never lose their funds to such an attack.

If the creator of Bitcoin reveals his identity right now and creates an exchange and hardware wallet, it will have a big impact on the Bitcoin market and this impact will be long-lasting in the market. If a person who is hiding suddenly reveals his identity, then everyone will definitely recognize him. Moreover, if he reveals his identity, the government will arrest him and confiscate the Bitcoins he has. He may even have to go to jail for tax evasion. If such a Bitcoin creator goes to jail right now, think about how the government can treat him.

The positive and negative impacts are certainly here but we can see the initial problem that will probably happen is that more and more people will force satoshi to show himself.
When he creates a stock exchange then indirectly he will also be required to continue to make himself a part of his stock exchange indirectly then he will be more active than usual. So there will definitely be a lot of people who target him, especially to make him curious about his identity.

But apart from that, I don't think we need to argue any further about this, especially if you look at the question you made, it's also just a possibility that will never happen.
Satoshi will still continue to be anonymous and he will never reappear with a trivial reason for his interest in creating an exchange because it is an action that will make the already built bitcoin turmoil move in terms of focus so that he will not reappear with such a ridiculous reason (creating an exchange or hardware wallet).

When the central bank of a country is in charge of anything that has to do with money printing money and setting monetary policy, people still use it even as it's centralized, because it's under a body they trust. It's the same way without question if there was a dedicated bitcoin wallet built by the founder himself excluding the popular bitcoin core wallet, we could have been using it not even a question if trusting it, if you trust bitcoin enough to buy it, you will also trust the wallet enough for that.

If there was a dex exchange under his name and supervisor with enough liquidity, I don't see any reason why I would abandon it to go risk my funds under a system that's built with the same idea I ran from (centralized)

Nope.

He or they are humans just like everyone here. You think we wouldn't have suffered an attack in one way or the other if Bitcoin had no contributors and mainteners since when he/they  left ? Who can even proof they left -theymos and co I guess

Ledger hardware wallet doesn't fit in this context, it is a supply chain attack, not an attack as a result of exploited vulnerability as in Coldcard wallet.

BTW, I don't think they will create an exchange but you're free to lose yourself in the realm of imagination.