Honestly, that's sus to me! His comedy is whatever (I rarely laugh at comedians on this show) but the fact that he hasn't managed to make strategic connections and catch a break elsewhere doesn't speak highly of him, imo.
On the other hand, this could speak to the "fixed" nature of AGT. Even after 15 years, it's still presented as a place where any Joe Schmoe off the street can get an opportunity to change their life. But as we all know here, people on this show are usually already successful in their field, have performed on other Got Talents, have a large internet following, etc. They are likely scouted via professional networks, i.e. through their agents and managers, which Michael Yo definitely has.
So either Michael Yo has a bad reputation within the industry, or this show is not for amateurs. They're not mutually exclusive, but I'm inclined to believe the latter.