Who debunked this and how? There is nothing to debunk in this, the tone, the thing he speaks, the way he spoke back then, heck any interview he gave in those times was super arrogant. He was a manchild in the 2000s with all his success and later defeats to his younger rivals taught him humility. There is no narrative to paint here bud, these narratives were painted in the 2000s itself, people know how the champ's mind worked even then, people later on know how Djokovic's mind works as well, the audience cannot be fooled, all these players when they speak they give a glimpse of whats in their minds, nothing needs to be painted.
Federer started chasing Sampras's numbers when he understood that he could..... later Nadal and Djokovic as they reached double digits they too understood they could chase Federer. Federer tried to play as long as he could to hold them off, thats a great thing to do, but lets not pretend like he never cared for GOAT and the other 2 did.