^^ Actually, it was even lower than that. The native resolution was 320x240, or around that. With the expansion pack, some games ran at 640x480 e.g. Donkey Kong 64, Star Wars Racer. There were one or two that ran between those two, I think, but that's it.
Also, I think they were talking more about the NES and SNES games, rather than the N64 games.