https://imgur.com/a/SNMsGFV Are these cassettes that can load various games when inserted into the SNES (Japanese version) considered emulators?

It depends on the game/mods which consoles are acceptable. [It's not an emulator as far as I can tell].

You can submit a game that isn't on the site and then add this as an emulator. Why not, N-gage is a console on some games like tony hawk LOL

P.S that converter is really cool