This 'project' is a violation of all libretro and related software licensing including the non-commercial licenses of relevant emulator cores. Under NO circumstances is this kind of thing permitted to be done with bundling the emulator with the ROM file (even a ROM you created) to be sold or distributed together.
Devs can either make a proper PC version or distribute ONLY the ROM file itself without the emulator. That's on them. They didn't make the emulator so they don't get to bundle it either.