Yes it is, yes it does, and no it isn't, in that order. For one, you don't recover on stage so he done already ****ed up by adding double jumps. He didn't include a lot of important **** like the Cyclone, Tornado, Jump, Lucario in Team Rocket mode, Bomb jumping, bike jumping, Wafting, Bowser's mashing Fortress, and more I don't feel like naming. Then he used moving platforms which screwed with some of the recoveries, so bam, 3 **** ups. What he shoulda did was make a stage with normal size blocks stacked onto each other, cause if iirc, each block is 1 meter or some **** like that, and that'd be a better calculation than how far they can go on stage with moving platforms (which by the way, you never have to deal with while recovering). Good idea, but ideas only get you so far.
And note, that's not even bringing customs into it.