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.
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.
Scene from Youtube: https://youtu.be/9ZUw8LYOQ-g