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1) He is a fool and apparently is comfortable with making such a risky move (a long bearish period can still be a possibility).
2) He probably knows (please don't take me as a conspiracy theorist, I'm just trying to imagine) that someone is gonna start another bull run soon, 'cause El Salvador attracted the attention of many big crypto investors, so a confrontation between Bukele and them about this topic is not so unlikely.
I doubt El Salvador will be having any bargaining voice in a global market, it feels good that they accepted Bitcoin as legal tender but if you look at the day when they legalized Bitcoin the market went through a major correction which shows that there are investors out there who wants to look at them as foolish, if not there is no way there will be a correction on that day.