Ehh, the dip buying is a bit more of a PR move in my opinion. He "only" bought 150 BTC, which is more or less $6.8 million. Whereas while El Salvador is definitely not a powerhouse country levels of wealthy, I don't think that $6.8 million will make a significant dent on their balance sheet.
True. We are talking about the country here not an individual and his dreams. So that money could come out of thin air and who knows he might actually turn it into something big cash inflow for the country. He would be a hero for doing so and then more investors and country peeps will get involved with the act of crypto space.
I am sure that this is well thought process of investment. That could be another public heroic act just to prove that El Salvador is consistently moving towards the crypto hub. Also there is another side for this picture, it is just to pump their balances so that they can have more owned keys and btc's for circulation within the country.