I have the same problem, and honestly I can just about force the thin side of the floss between my teeth but it’ll get stuck sometimes (as the tight part is the top of the tooth), which is just not great.
The brushes, which I was excited for and bought the smallest size of, will only fit under the problem area - and are uncomfy.
So I use them to clean electronics 😅
Sadly, I think this person is railing against “having more than just white guys featured” (as if that’s forced, when you start making games in new locations around the world) rather than the bland Ubi-style open-world map checklist that you might expect to be the sane complaint.