As in the rumor references itself, people are taking the existence of the rumor as proof the rumor is true, but in the thread (when I last checked) nobody actually posted anything remotely usable for even a shallow tech investigation piece.

Like the guy saying he didn't pick up when Meta called. Was it actually Meta? What are the conditions for the invitation? We'll never know, but apparently this is enough proof of both an NDA and Meta trying to force admins to do something they don't want.

Hopefully that explains it.