Except for the OK sign for money I've literally never come across any of the other hand signs in Japan. In fact I was surprised they didn't attempt to give a Japanese meaning to the V sign, though even I am struggling to come up with a word for it to be fair lol. iirc Japanese count like Europeans too, starting with the thumb for one.

idk even if those other hand signs do or did have those meanings, Japan is not a very gesture heavy country it's entirely possible they're all old fashioned and not used anymore.