He seems very amused by the accusation in that video.
Regarding his video to me this sounds like if you were to ask Djokovic to play 46 tennis matches versus players ranked between 5 and 400 in the world, could he win 45 out of 46 matches and draw one game (not possible in tennis but hey)?
I mean: Djokovic literally won 41 matches in a row, including several matches against opponent from the top 5.
From the opponents' list, it looks like there was no Magnus Carlsen and not any top 5 players in the world?
Is it that surprising that a world champion crushes competition like that?
I don't know but I'm not that suprised.
P.S: I'm making a tennis analogy because Hikaru likes and plays tennis