This is all good supporting evidence, and hats off to Raven and others for investigating this themselves and not relying on other people's say-so.
As mentioned previously, I may not be much of a gamer, but I despise liars (long story) and have developed keen instincts for rooting out deception. A very long time ago, I learned not to take people at their word, and always expect to see proof of any claims someone might make.
Curiously, most of the focus appears to be on MAME, when in fact there is much more evidence to consider. For example, the "Boomer" videos are crucial pieces of evidence which seem to be largely ignored. In addition, there is body language, eye movements, facial expressions, speech patterns, etc.
For example, I just spent the last two hours doing nothing but listening to the most recent Billy Mitchell interviews, taking note of how many times certain key words or phrases were used. It gave me a massive headache (literally), but the results were very telling. In this case, I have never heard anyone say "The truth of the matter is" or "The fact of the matter is" so many times in my life. Who talks like that? There were so many red flags that I could barely keep up with them.
And the way Billy Mitchell reacts to being directly called a cheater by so many people is anything but normal. Suppose I were an arrogant jerk who came to this forum bragging about how good I was at Donkey Kong and that I thought that random person X from the leaderboard was a cheater, how might they react? Since all of them appear to be very legitimate players, I suspect their reaction would not be good. At the very least... it would be on like Donkey Kong.
I'm not one to blatently call someone a liar, and generally try to be fair and impartial, but the mountain of evidence against Billy Mitchell is overwhelming. Frankly, I don't find him to be a very likable guy, but that's just my opinion and I would never let it cloud my better judgement. Facts are facts, right?