>>1839900,5Ah, well I don't know about the threads, but the bans thing has been known about for a long time now. The bans are pulled from 4chan's ban page itself, which only reports on bans based on the individual moderator's discretion. If your post was something obscene, pornographic, or is information a mod wants to suppress like dox or staff corruption then it will never be made visible. In fact, out of the many bans I've gotten since this feature has rolled out, I think maybe 2 ever appeared publicly.
I imagine it's a small box they have to checkmark or something they have to click for the bans to display when banning a user.