Predicting yourself isn't relevant to free will because being free means that you aren't controlled (or perfectly predicted) by anything else. You are you. So if you predict you, that's fine. You control you. And you can also be free without actually making any prediction of what you'll do.

So violations of your own expectation of yourself don't say much about free will one way or the other. But violations of Laplace's demon's expectations say a lot.