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While my technical exploits are no where near this - I love reading about people doing odd and difficult things for fun.
(As a young teen who was obsessed with Road Rash on the Sega Game Gear, I wrote down every single save code, after every game I played, along with what I had (bike, level and cash) - after a week or so of doing this I worked out the save code and was able to give myself any level, bike or money by manually tweaking the code. I am sure that I am not the only person that discovered this, but at the time I felt like a god and enjoyed racing the later levels with the worst bikes etc. - sometimes it's just fun to do something because you can.)
I expanded in a sub-comment: I am not challenging that it was done, I would like to hear about the motivation to do it.
There's no purpose for the result described on Github, and also no background why it was done.
I have no value to run Windows NT on a Gamecube, but I would surely enjoy the story on why it came to be :)
Either way, always nice to read the chain of thought which drove someone to do something- :)
The page doesn't seem to mention the Gamecube Ethernet card or the Wii's Wi-Fi support, so it might not have any working networking, so that might be a more important issue.