Well, the example came up of Musk intending to buy Twitter and then trying to back out. The plausible justification for flip-flopping is that an internal review unveiled information that would justify this. It's really not hard to imagine.

That lead to a refined claim that Musk said he would not even perform this sort of review and then changed his mind, but without a clear source attached I'm not sure if this is actually what Musk said.