https://theconservativetreehouse.com/blog/2021/10/17/pm-trudeau-and-canadian-government-ban-phrase-lets-go-brandon-from-any-government-correspondence

CTH posts are no longer showing up in my Inbox, but I can see them in my RSS feed — just not in a timely fashion.

Update: Now they are back. Either the blacklist was temporary, or CTH implemented a fix at their end.