Dont forget about his run game.. which is average at best.
The interesting part comes in closer to the bottom where he compares Ryan's career to Peyton Manning (who also had no playoff success in his first 8 years) and to Tom Brady. In the case of Brady, if you were to reverse his career, people would be calling him a choke artist. Right now nobody does that because of his wins early in his career.
Also, its easy to look at W/L record in the playoffs to criticize a QB.. but that isnt always the best way. In AFC championship 2 years ago, Flacco played well enough to beat the pats, but his kicker blew the game for him. The same goes for Ryan in this years playoffs. He played well enough to win, but because of the defense and a stumble from a receiver, he was the loser.