Such accusations against the RCC may (or may not) be true, but they do little to prove or disprove Rivera's case that he really was a priest. And if he wasn't really a priest, his whole conspiracy charge, based on his supposed first-hand knowledge, experience, and access to insider information as a priest, falls completely apart. If his foundational argument (having been a priest) is a lie, who's to say what's built upon it isn't a lie as well? The proof of the conspiracy is founded upon his first-hand knowledge as a former priest. No priest = no proof.
Any defense of Rivera needs to be made for his own credentials, not against those of his opponents.
People will either believe or they won't. The adroitly promised plenary indulgences for all who can expunge the record of Mother's dirty laundry is a successful tool that has been used for centuries. Nevertheless, His truth is marching on.