I don't think he was trying to rip so much as critique BB.
Regardless of how good his coaching was this season and we know that he could not have foreseen the TE situation, he still left the WR core in a dismal state for far too long and it came back to bite him. The article basically claims that the offense was designed around having AHren, Gronk and DA healthy and productive, and that there was almost no viable backup plan because the team's remaining passing attack was mediocre at best. Instead, the next best strength was running the ball.
I don't think everything he says can be discounted, but he's also not being very realistic about his expectations. Denver has a ridiculous amount of talent on offense, much more than most teams, and could stand to lose 2-3 players and still field an average level of talent.
Very few teams could lose 2 of their best players (around which the offense is built) and remain competitive, nor would many have legit backup plans at other positions the way Denver does.
