I left Amazon several years ago after having a really bad manager. Never had a PIP or anything (at least never communicated to me).
Surprise, surprise: a recruiter reaches out to me after many many years about a senior position and guess what? They can't move forward after speaking to HR leaders.
After being a manager at other places, it is almost unheard of to have someone leaving flagged as "not regrettable" and prevent someone being rehired. This only happens for a serious HR violation or some bad perf problem.
This is the main reason they need to get out of Seattle and Bay Area, because sooner or later they will run out of fresh meat.
So everything make sense now, right?