El Salvador just made Bitcoin an official legal tender. So I don't find any things that they will fall because the price of Bitcoin is dumping. If they are using the people's money for investments like buying Bitcoin and the price of Bitcoin is dumping then there is a possibility, which I believe they already have some Bitcoins bought in the past few months.
The reality is that even if they are losing money, between all the corruption and all the bribery, most nations are spending a lot more of the treasury towards stuff that will not help people at all. Look at EVERY government in the world, politicians are usually rich people, there could be a few exceptions but the problem is that presidents and senators look like they are "ruling" a nation like kings, instead of thinking like they are our workers.
El Salvador could have done worse, there could be someone stealing this much money from them and putting in their cayman island bank accounts or panama or mann islands or whatever. Hence, this is still a great deal.