I guess if he means that this team is the most switchable and versatile in history because pretty much any player can guard any other player on the other team, I could agree with that. So far they've been able to shut down Durant, which isn't an easy task. The challenge is going to be defending teams where you may not want to switch, like Embiid or Giannis.
It's hard to compare eras, given the changes in rules for the defense...The Bad Boys and the Bulls were built to defend offenses from those times. The game is much less physical than it used to be, but on the other hand nearly anyone on the floor can shoot from the perimeter now, so you do need those switches.
I don't think it's the best we've ever seen, until we shut down every team on the way to a championship. But it's good, no doubt about it.