The funny thing is that even if Karl proves that Billy used MAME, got caught using MAME, then lied about using MAME.
That doesn't mean he cheated. There's lots of speedrun categories where using an emulator is just fine. If anyone thinks a CD, cartridge or arcade machine stops people using rom hacks to manipulate rng, they are naive.
I'll actually be watching this with some interest because Karl is going to have to prove Billy cheated, or pay out for slander and libel. No one has ever been able to prove Billy cheated, just that he used an emulator.
I don't like either one of them tbqh but Karl should pick his battles. He's very confident he will win, but he can't prove Billy cheated, and that's what he claimed Billy did.