I mean, not to say he's not, but by what metric?

If by company success, then Zuckerberg and Musk are better than all of us.

If by millions made, as he likes to joke/brag about... Fabrice Bellard is an utter failure.

If by install base, the geniuses that made MS Teams are among the best.

None of this is to take away from the successes of the man, but this kind of statement is rather silly.