That thread states, "I think the capacity on the gamecube disc is around 350 megabytes." "no, gamecube discs are mini cds."
Clearly the people there have NO clue what they are talking about. In contrast, there are a slew of articles about how Resident Evil 2 is the world's largest (and most-expensive) cartridge. Unfortunately I don't have time to look them up right now, but google.com has plenty of links.
If you feel KOF2001 is bigger, just show me a copy of the ROM, which will say how large it is.