The IMF feels bitcoin is a risky asset and doesn’t want to be a part of that gamble when making its loan. The IMF has a history of making lots of conditions they feel minimize risk.

To me it looks more like my bank mandating I carry certain kinds of insurance in the terms of my mortgage than a political bias, but I am not an expert.

"urged officials to limit its exposure" is what the Reuters article said, so yeah. They think El Salvador's ability to repay the loan is tied too much to BTC.