None of them are revisions, obviously. They're all clearly new systems that just happen to share some games and technology with prior systems.
While it is a new system with a new OS and interface, from a hardware perspective, the Wii can be justified as a revision of the Gamecube. That is why people were saying it. The prototype Wii was literally a GameCube and a Wii remote.
This is why I said, if anyone wishes to consider the Wii as a revision of the Gamecube, that would be IMO objectively the best revision of Nintendo hardware in company history. Otherwise, GBA SP. My personal favourite is the DS Lite, as I skipped the SP and actually played most of my GBA games on DS and DS Lite.
I describe myself as a little dose of toxic masculinity.