This seems like it should be really simple to fix. If a tag disables the NSFW filter then filter out the tag itself if the NSFW filter is turned on.
Viewing post in Delete all ADULT games
Itch tag system in general is flawed, I really think is a priority to improve. Just the fact that one can't put a tag to not show is something very bad. Itch is for so many kind of games, and I think that's amazing (This is the only game website with that principle, I think) but precisely for that a good tag system is crucial. It has many years as it is so I don't know then they gonna improve it.