This is always true but does it help your or any entity if you can not hold your Bitcoin long enough to get profit?
No one is helped by that except the Bitcoin holder himself whose price is already greater than what he has ever bought in the market.
You don't know how long you will have to hold it to the profitable date so don't bet. El Salvador President bet that Bitcoin will rise in near future and his country is in serious debt crisis. This is his mistake and collapse can occur if his country has to sell all Bitcoin to get cash for paying debt interest or other reasons.
Not only me, but everyone else will also not know until they have to hold the Bitcoins they have for profit. So it's true that it's not forever in the long term, but when the price of Bitcoin decreases and becomes cheap in the market, Bitcoin almost very often takes a little longer to rise again to a higher price so the analogy for the long term is always more suitable though it is not known when the auspicious date will occur for sure.
However I disagree to anyone accuse El Salvador. They just made a history for Bitcoin and the world and we should appreciate that. Especially if the argument or accusation is from people (I don't say it is you) who got profit with the bull run of Bitcoin that is partially contributed by El Salvador legal tender news. They should say thank you to the President and El Salvadorians.
I also don't like any accusation if it's not based on clear evidence against it (El Salvador). But for me what El Salvador is doing is something that can influence other countries to take Bitcoin more seriously even though El Salvador is still experiencing losses at the moment because Bitcoin has not increased as much as El Salvador wanted.
But if El Salvador can survive the difficulties they are currently facing, then there is a possibility for El Salvador to succeed through their investment or through the adoption of Bitcoin that they have done.