Not hyperbole. He doesn't get it. He is a Cargo Cultist.
This entire series of videos is disqualifying of him as any sort of game design expert.
He is doing exactly what Blizzard says World of Warcraft players do: correctly identify issues, and completely fuck up the reasons for why (and thus solutions for them).
Mearls isn't entirely out of the loop. He knows that the OSR exists, and thus that the #BROSR exists because he'll hear back about Braunstein being rediscovered and applied- successfully, over time, repeatedly and reliably.
This means that he is aware that there are people who actually play the game properly, and can explain what that game is with citations and how it works, but this slides off the brain that's as smooth as his bald head because he cannot connect the two to comprehend how solving what he complains about means actually playing the game as it is- not as he thinks it is.
He admits that Combat is where the focus lies. That's because Combat, in every shit-tier D&D edition, is the only actual game in the book. Everything else is Mother May I? levels of Calvinball run by people that hate you who use words as weapons to prey upon you; that is not a game- that is a humiliation ritual.
Yes, that is correctly identifying the issue.
He then fails to identify the source of the problem and thus cannot provide any viable solution to solve the issue. His comprehension of what this hobby and medium is, and how it works, is absolute retardery unworthy of being tolerated out of the mouth of a child. The root of the problem IS THAT YOU THREW OUT THE REST OF THE GAME! Put that back, run it exactly as the user manual tells you to do, and (as the #BROSR found out first hand) all those problems GO THE FUCK AWAY!
Put the rest of the game back. Simple as. The Bros proved it. D&D is a Braunstein.