Earlier quoted context omitted.
It wouldn't surprise me if someone glanced at the "Probabilistic Programming Team" name and said "I don't know what that is but I doubt we need it" and added them to the chopping block.
Facebook/Meta is an engineering-first organisation. There's no way that is how it went down.
Moreover, there are still a lot of decisions being made that are basically down to politics rather than engineering merit, or there were while I was there.