It's a confusing time - digital asset stockpile, national bitcoin reserve, the executive order, plus all the fluff on social media platforms...lots of posts and media out there propagating overstated things that simply aren't true about the recent news. Lots of noise to sift through...

TLDR:
Digital asset stockpile includes bitcoin and altcoins, national bitcoin reserve just includes bitcoin, both of which currently only represent what the US own and will not sell. Nothing about buying yet.

Extended summary:
Without overstating anything, here is my understanding in the context of your post and in a bit more expanded summary:

The digital assets stockpile and the national bitcoin reserve are two different things...it includes (afaik) what the US Government already hold and the recent executive order makes it official as the national reserve and stockpile (what they will not sell). They can sell existing things to buy Bitcoin/other digital assets (including gold reserves or other assets), though nothing currently permits taxpayer money/any budget that costs the tax payer money to be used to buy Bitcoin or digital assets.

The proposal to be kept an eye on is the Strategic Bitcoin Reserve legislation by Senator Lummis which is not expected to pass for some time (according to some members, could still be years away). This would permit the government to allocate budget to buying Bitcoin (specifically up to 200,000 BTC per year).

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If something above needs correcting, please directly quote what is incorrect and correct it (for the sake of clearly understanding what is wrong with the current summary and to be able to easily improve it)!

Confusion, fluff, false news, propagating overstated, lots of noise... It sounds to me like Pi coin (or whatever it is) will be the chosen altcoin currency for the US reserve. 
Of course, I'm being sarcastic. But looking at what Trump has been doing these past few months, I guess no one will be surprised by his decisions.

yes back then all trump talked about was bitcoin and so everyone thought that he was only interested in bitcoin it wasnt such a bad thing anyway since to a lot of crypto enthusiasts bitcoin is the most important cryptocurrency and the best one so i did not really care back then if altcoins were not involved in trump's plans but it is still good that he is now exploring more in crypto
he did say that those altcoins are to be part of the reserve it could be market manipulation but if it is it is not working very well hence why i do not think it is but we will see if trump does not fulfill his promises then it is market manipulation what he is doing now

Well, maybe you are actually in the wrong because according to what I read online, it was stated that Bitcoin has been accepted and that the US government will create a reserve with it.. But moving further, Trump and the whitehouse are also looking or considering taking Altcoins in the top 6 or 7 according to their marketcap ranking and making a strategic reserve of this alts as well, this has not been concluded, it was only a suggestion or idea which I believe, Trump and his government as well as the whitehouse are still discussing about to arrive at a final decision.

There was not any market manipulation, the only issue is that alot of people fail to verify informations themselves before making a decision, they tend to listen and depend on media which twist information at times.

Are you really surprised? Trump has been manipulating the market for a long time, it’s just that not everyone notices. Even before his announcement, there were already reports that his son knew the market would turn bullish, so aside from manipulation, there’s clearly some insider trading going on too.

And about the crypto reserve, the phrase "they talk about" makes it sound like it’s still just a rumor. So instead of jumping to conclusions, why not wait for the final publication to see if altcoins are actually included or if it’s just Bitcoin?

Well, the United States is talking about having a cryptocurrency reserve and not gambling with the national wealth, I don't blame Trump for mentioning only Bitcoin and we should not limit our scope of understanding of his statement to mean Bitcoin alone, but all other cryptocurrencies that the state fines on to put tax players money on, but note that Bitcoin is going to occupy the center stage of the whole thing, and for sure it will means other coins like Ethereum a d carbonado that you mentioned.

Trump has zero value on his words. What he says, changes day by day. So I won't be surprised if the altcoins are dropped from his plan of national reserve. Because there were a couple of altcoins in his plan earlier.

However, if these have been dropped, that makes sense too! Bitcoin is the biggest cryptocurrency as per the market size so I don't think any other cryptos are needed in reality.

For me, there is nothing like confusion with the United States Bitcoin reserve policy because it avoids all confusion that the president decides to focus on Bitcoin alone instead of spreading their focus and that will lead to the confusion that you mentioned, the United States president is Smart enough not to have mentioned altcoins join the crypto reserve because of the risk that comes with coins aside from Bitcoin, so let no one speak about confusion in all of this since it a clear case of smart national reserve.

To start with I won't even buy the idea at first that the US will actually implement altcoins in their reserve this is because of what we see everyday on the general altcoin market and how they are easily manipulated. The US government isn't actually blind to all these things so they should be able to tell that a long term currency is suitable for a reserve.

This could probably be another news to tear up FOMO in the altcoin market that will anchor a massive manipulation.