I know it is hard to believe. But the gamecube, Wii, and wiiu are the same machine. Same architecture and family of processors (IBM’s PowerPC). That’s why the wiiu is just a Wii with a beefier CPU (three Wii cores slapped together), and then a newer more powerful GPU sticked to the side. Thats why a single emulator can target all three consoles. The switch 2 will just be a newer version of the Tegra chip.
True that, the tri-core PowerPC is quite a unique challenging mess. But underneath it is just the same processor.