It's true but the PS2 is a much more convoluted system to emulate with more moving parts and undocumented behaviour in the timing and interaction between these

It's true but the PS2 is a much more convoluted system to emulate with more moving parts and undocumented behaviour in the timing and interaction between these parts as compared to the relatively simpler Gamecube. This also made the Gamecube easier to develop for IMO (I developed games on both systems)