He's saying, in the context of the thread, that Brady is overrated because he's receiving too much credit for the team's success, and too many people detract from the other players and give Brady the credit. I thoroughly agree. Saying he's a grade A passer but being overrated may look odd in a nutshell, but it's really not. It's a concession that Brady, despite the fact that physically he's not a specimen, is an outstanding passer. But it's also saying that the credit he receives for the teams success is a bit overboard. There is a myriad of reasons the Patriots were successful. Brady's skill is one of them. Belichick's scheme and putting his players in a position to succeed is another. Brady's supporting cast, despite being "weak" (in many people's opinions) in some of the skill positions was strong in many other places, including virtually the entire defense. He had support systems in place that helped
him succeed. Saying any single player won a Super Bowl in and of themselves is a dead giveaway of a single player being overrated, or to put it in another term, being given too much credit. I would think that Brady would concede that as well. Without teammates and coaches, Brady can't win. His guys put in the work and Brady's incredible skill combined with his coaches scheme won those Super Bowls. Not Brady alone.
I think he has, as I explained above. He's giving Brady a grade A as a pocket passer. But I believe, and he will correct me if I'm wrong, that he's saying giving Brady as much credit as he receives for those Super Bowls is a defining characteristic of overrated. I don't believe he's speaking of Brady's ability to run Belichick's offense. Just the fact that he's given the lion's share of the credit. But I could be wrong.