Thats not true though, they have a "max" resolution, but not a fixed one. Just taking the above image and reason for rejection above, "The Nintendo NES have 256x240 internal resolution" Thats only true for PAL region, NTSC was even lower at 256x224, so if a 256x240 image was added with a US region tag, that should technically be rejected if we are only using "native resolution", that is if we go on the logic the rejector offered up.
Then take something like the PS1, we gonna just limit the database to just one of its many supported resolutions?