if I had to guess
pissed off by the way they dealt with COVID. from what we heard, they decided to enforce contact tracing in a stricter way than other Ivys even did among students, faculty, and staff. maybe prior to that he was starting to wonder about a new challenge which would be reasonable. add to that, the fact that he must have known his reputation would help momentarily stabilize a program that had already been announced as gone. I can see how it would make some sense and all the sudden its Silicon Valley culture shock