I think theyre talking about excessive violence or smt similar rather than any sort of nudity. Perhaps he feels his game has too much blood pr something. In case he is talking about nudity, you are required by a majority of national and international law to mark anything even close to that as nsfw.
Given their regular content[*] I would rather imagine complicated gender stuff - but I wouldn’t want to assume anything.
It’s a bit hard for most kids to grasp the concept since they themselves are asexual, from an adult’s perspective. Real life example: I know a couple that have a biological child, but due to the blessing of gender confirmation surgery there are now two fathers. Their offspring still calls one of them “mom” because that’s what they are used to.
[*] like what I would call their springs series