The article mentions that the Wii U had gamecube compatibility. I wonder how that was achieved? And I'm guessing it can't take the small optical disks of the gamecube.
The Wii was compatible with the GameCube largely by being basically an enhanced GameCube under the hood, and the Wii U is kind of a further step down that same road with its "vWii" backwards compatibility mode, so it's possible to use homebrew to play dumped GameCube games on a Wii U natively, only providing some light glue to hook things together. It's not officially supported though.