Ok, so according to this, you can release regional variants on the eShop, as it should be, and AdHoc just effed up.
"Long-term Switch owners are likely familiar with the fact that some games are the same no matter which country you buy them from and some games aren't. This is because publishers can choose to release their games either as one file for the whole world, or separate files for different countries. AdHoc is an indie studio, so they likely chose to just make one version to release worldwide. It costs more money to release and maintain a separate version for Japan. In order to comply with CERO and also release just a single binary, censorship is necessary.
Noteworthy, Cyberpunk does this. CDPR sells a separate version of the game in Japan with a CERO Z rating that censors the nudity and removes some gore."
