so I decided to untag Adult but I'll keep the metadata
The tag adult does not do much in this regard. It is only the metadata that counts. You could release a game without any tags and still mark it as nsfw.
There is no inbetween on itch, like certain mature or sensitive content warnings/filters you might see on Steam for example. And the term nsfw is ill chosen anyways, but this is me picking on exact words. No game is sfw, because people would not be allowed to play games at work. I guess is is some US euphemism thing.
The nsfw meaning on itch actually translates to: forbidden for minors, or adults-only. If it were a movie, it would have rating AO, NC17, R, 18+ or something similar.