I think "lucky" is the better word here. He was lucky because he was able to get all of his money out of the bank while he could. Maybe he knew something was happening before others? Maybe he was just able to move faster? ¯\_(ツ)_/¯

Regardless, he definitely helped contribute to its collapse, as well as everyone else who took their money out of the bank during the run. To what degree is Peter Thiel responsible? I don't know and I don't think it really matters.