I don't think so (and I've been here for years!)
What does get deleted aware potentially libellous comments, or those which really aren't in the spirit of the site.
So for example, it was OK to slate David Cameron as a prime minister, and to a large extent as a person, but comments about Ivan were very likely to be zapped.
There has never been a ban in McCann threads, but there was no tolerance of posts which repeated the worst of the bottom-feeding of other parts of the Internet - including when posted to deplore what was being said elsewhere. This policy does seem to have changed recently though.
When a thread has many deletions, it is often deleted in its entirety. That is, I think, a shame, as interesting and unexceptional seven or eight pages of discussion can vanish along with one page-long derailment.
Bottom line is that MNHQ decide what has to be zapped, and that tolerances can change unannounced. And that it's never been a platform for repeating scurrilous gossip - even though it is no longer a clearcut deleting matter as it was in the past