That's not gold, but brass.

Each physical coin worth the same like the real Bitcoin (if you fund it with 1 BTC, nothing less nothing more).

Based on the description, it's just a badge, so it must be cheap.

In physical bitcoin, the private keys are simply embedded into physical objects. A physical bitcoin without this embedding is useless.  Physical bitcoins has a hologram feature. Underneath the Hologram it contains the private key so your Bitcoin is actually held at a address and the private key is needed to get the Bitcoin off that address so the private key is affixed to the coin and placed under the Hologram. I couldn't watch the video but if what is in the video doesn't have this feature describe, then it is just a piece of art with no use.

It's never going to be worth the same as one bitcoin if you create a physical one unless of course, that coin is really a wallet and it's got a bitcoin in it and you can store it there then yes a physical bitcoin can be of equal value to a bitcoin although it's just a pseudo value since it's just a wallet that made to look like a coin. I don't get what point you're trying to deliver to us OP but bitcoin can never be replicated so if by some miracle that someone made a physical bitcoin, it's going to be a fork since the supply of bitcoin is fixed, meaning that it's just another bitcoin copy that's trying to capitalize on bitcoin's fame, that's all there is to it.

OP, the simple answer to your question is that Bitcoin is not a centralized asset and it is not a cryptocurrency that is pegged to any physical asset or property; it's only a digital currency, and I don't think there's any way a physical gold, bras, or diamond-designed coin can be pegged to the value of Bitcoin. 

Take this discrimination.

The price of gold, brass, and diamonds is not the same as the price of one bitcoin. Gold is measured in troy ounces and Bitcoin in SATs. At present, 1 troy ounce of gold is $2,165. With the current price of gold, if someone wants to make a design of a Bitcoin coin right now, he will need about 32.5 troy ounces of gold to make that coin. 

Secondly, we know that the price of gold doesn't have the same volatility as Bitcoin, so if the price of Bitcoin gets volatile and reaches $80k while the price of gold is not volatile,  the 32.5 gold coin design in Bitcoin shape will not be equivalent to 1 Bitcoin any longer. 

So, it will be very difficult to make this equation balanced because Bitcoin doesn't have the same volatile level as gold and is not also centralized. 

It is $69,871 on me as of typing this through coinmarketcap.

They are looking to invest because they can see the profitability of it. But then, when they realize that it's getting more expensive, they can't afford it anymore and they don't want to buy it any longer.

Nope, if it's minted just like what are being sold in the collectibles that it has a private key and with Bitcoin inside then it is. But if it's just a gold plated coin and designed as Bitcoin, it's more of a commemorative coin and it's far from the actual value of Bitcoin.

Bitcoin is a digital currency and making it into a physical form wouldn’t give it the same exact value, I think. Why? Because the physical value would be worth whatever is the worth of the material used. If for example you used gold for it then the value would depend on how many ounces of gold was used. Even if it was some cheap material, I don’t understand how bitcoin could be physical. Yes there could be an embedded address but if you were to give that physical coin to someone, how would that reflect on the blockchain? Which just defeats the whole purpose of bitcoin in itself.

There is no physical bitcoin and even if a physical bitcoin is created it will never be compared to bitcoin and will never have the same value as bitcoin. Just to show the coins you usually see. Bitcoin is a virtual currency. Note that even if you have a hardware wallet and you transfer your bitcoins to it, the bitcoins are not actually in the wallet. The wallet only holds the private key and controls your bitcoins.

OP, I was looking for the link to the video you were talking about on your post while reading through but I can not find any. If it were available I could have been able to get more facts and that could have been okay. I will advise you edit and include the link to the video so that people could access it.

I was having a thought over this topic after reading through comments and replies and I realised that creating a physical Bitcoin might be too risky and come to talk of it, Satoshi never made mention of creating physical Bitcoin in his white paper and I believe he never intended to do such. Although I understand that as time goes on there would definitely be am attempt to do such but would it be effective?

Bitcoin is a digital currency and not a physical one which makes the value more appreciable so therefore mimicking Bitcoin for physical gold would hold no much value because that is not amongst the reasons why it was invented. Bitcoin has already surpassed the value of gold so bringing it down to hold level would make no sense.

Unless that physical coin can be used like a cold wallet or something like that then you're totally right that it's not worth the same as a bitcoin (the digital kind), the only way that it's worth is it's weight since it's gold. Also, in the theory of bitcoin becoming a physical coin and the question of will it be worth more as a physical one, I don't think it will be because there's tangibility involved and there's no scarcity since there's no lost bitcoin in a sense that it won't be recovered forever. The only scarcity that would happen wouldn't influence the price of a physical bitcoin to go much higher would be the limit of how many is made, the maximum supply doesn't really dwindle since there's really no way it can't be lost forever.