I'm not sure that's true. There seems to be more a general thing to flag politics as it's not so much what the HN is about. The most prominent owner is probably PG who wrote a long thing on why to vote Kamala.
Post a fact about how bad is the far right, including the current US administration, and it will be flagged.
Post a fake news about how good is the far right, including the current US administration, and it will be right on the front page, no matter how much you downvote or flag.