A lot of Bitcoiners actually don't understand what's going on and paints IMF in a bad light. Now, El Salvador needs loans from IMF and that is the core issue. They have the rights to dictate what the country should do with the funds. It's perfectly normal for them to be able to dictate what should be done with the money and what shouldn't.
Primarily, IMF's goal is to help countries through financial aids and loans. To do so, the country themselves must be able to implement sound policy to achieve long-term and sustainable growth. Agree to the terms if you want their aid, if you don't want to agree to theirs, then there is no good reason why you should kick up a fuss when they refuse to commit to the loans.
Maybe the IMF does not want El Salvador to be an example that every country will follow because it will clearly make any country able to quickly pay off the loans that the IMF provides and is considered the profit that comes from the bubble. From here we already understand what the IMF task is like and what is clear is that they are worried if the influence or example of El Salvador becomes a new benchmark in the global financial industry.