The tl;dw is that new photos surfaced of Mitchell at the event where he got one of the high scores in question, in front of the arcade cabinet that he played on. One photo shows a clear shot of the joystick, which is long and bright red and blatantly not the original joystick.
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The original 4-way stick was upgraded for a more modern 8-way stick.
The kicker is, one of Mitchell's witnesses for this game also testified that he used this exact same modded cabinet at the other event where he got that other high score that got disqualified. So both scores are clearly disqualified without even having to take game play footage into account.