My radical opinion is there shouldn't be 2 flags, there should be N flags, user defined, so that we can flag humor/satire/factuality/insight/political and a bunch of other things. I fully realize that's not going to fly any time soon.
Adding AI in addition to the standard up/downvote and flag seems a reasonable thing.
That sounds like /.'s moderation system. Not that I disagree, theme based filtering could be fun but also encourages things like meme threads that you'd see on reddit under the guise of "Just filter funny out and let us have fun".
I think the up/downvote system is good enough for that - good posts go up, bad posts go down, really bad posts that nobody should see and whose poster should get banned get flagged.
Adding AI in addition to the standard up/downvote and flag seems a reasonable thing.