$50 million is really a small sum for any country, even as small as El Salvador. If they had 10% or higher of their foreign currency in Bitcoin, this would be a problem. I'm actually surprised that despite all the Bitcoin maximalism rhetoric, El Salvador didn't go as much all in on Bitcoin as Microstrategy did.
I think it's actually closer to $100 mln instead of $50 mln but yeah, it doesn't change your point and I agree with that: for a country that's a very small amount of money, even for a very small one like El Salvador.
El Salvador made the strong decision of making bitcoin legal tender, but in terms of holding El Salvador didn't go much on bitcoin. It slowly started to acquire more and more during the drops, and if El Salvador have adopted bitcoin earlier now the holdings could've been big. As said, for a country the decline of $50m is not a big think. On the other side it has got pressure from World Bank on interest to be paid this July.