I haven't looked at his videos for a bit, but some of his original videos were of him running his V8 Maverick on a lawn mower carb. Showed him driving around normally, stopping, starting, etc. and cruising up to 70 mph, then getting out of the car and popping the hood to prove that was what was on there. But what he discovered was the tiny carb setup actually ran rich (the opposite of what everyone claimed it would). So he made the "cheater" which was a circuit board and air valve coupled with I believe an AFR probe and his custom software, to pull in extra air (through a filter) as needed below the carb to lean out the mixture to what it needed to be.
That was my understanding of his videos but like I said, I haven't checked in for awhile and just watched a few casually. But yeah, he seems like a smart guy.
Pat