Did you actually cheat?

What is your Mario Kart Wii username and Friend Code?

What is the relation between "twitch stream" and "banned for using various cheats"?

Basically, he went into the friend room of someone who was playing MKW and streaming it on Twitch, and despite the streamer (who was also the room's host) requesting no cheats in the room, and repeated requests for him to leave once they realised he WAS cheating, he insisted on using cheats in all 4 races of the GP, while taunting that he couldn't be banned for it because he was "FTL hacking". Needless to say, he got reported and banned shortly after. He's been pestering anyone who'll listen ever since that he was banned unfairly and deflecting blame away from himself wherever possible. I've been dealing with a fair amount of it.

"I'm sorry officer, I didnt know that I couldnt vandalise the property with graffiti! Please don't arrest me!" - and that's a public example. You have 0 right to access a private service, and if you're banned that's your fault, not Wiimm's. Don't break the rules.