for context, the og 'nintendo hire this man' guy constantly takes models, textures, and even scripting, to retool into his projects with almost never providing lasting credit or bothering to understand their innerworkings, & regularly states that he does every aspect himself.
and not from the official games. no. they're from other fan works. from creators far smaller than him.
this clip is from over five years ago. he has never clarified that the work here was not his own, or acknowledged the attribution license tied to it that requests attribution to be readily provided.
the most insidious part:
if a creator were to try to do anything about it and requires him to remove content with it if he won't provide attribution, it would simply be perceived as nintendo silencing yet another innocent creator, and popular news outlets eat this stuff up no matter how little skill or respectful conduct is actually demonstrated.