Wouldn't really consider that set vs Oats representative of either character's potential or how to play the matchup properly. Your limited use of hover/HC was clear even to non-Mewtwo players, your use of teleport is very rudimentary and predictable, combos often overextended such that you couldn't set up edgeguards or kill confirms, incomplete use of available ledge options, etc. Rewatching it from Sheik's perspective, Oats' grab game is very unoptimized. He didn't seem to fully understand his options out of any given throw (dropped followups or overextended several times), nor did he make any real use of his mixup potential (which Mewtwo has to respect due to hurtbox size, holding down means you'll eat followups from both dthrow and bthrow). No use of fthrow at the ledge, no use of crouch dashing or pivots to extend or improve his DD game, etc. He was also far too content to shield options he could have whiff punished (hello fsmash).
You have no footage that I can find vs TR, so I can't critique that. I may move him down to slight loss eventually, but Tink makes Mewtwo work very, very hard when playing to the matchup. Mewtwo has to take more risks, and more significant risks at that, to make anything happen on his end.