That's odd, I've played multiple games with side or even main characters be underage (but have no h scenes) and they were completely fine (e.g. Emiko from CoR. Hell, I've even seen a creator post gameS with lolicon content (don't worry I'm not subscribed to that creator) on Patreon and yet nothing happened to them despite me reporting them. Had they checked those then ? This is absolutely stupid of them.
Edit : also why are Koikatsu models not allowed ? I've seen games with fucking AI-generated images be allowed.