People are misunderstanding the rules. When the QB is out of the pocket, there can be no illegal contact, so you can try to shove the receiver, get your hands on him, etc. UNTIL the ball is in the air. If Eli throws a catchable ball to the guy and while it's in the air Church is mugging the guy, it's pass interference regardless of how many yards downfield they are.
Collinsworth was just pointing out another thing Eli did wrong on that play basically. I mean, just in the last 3 plays of that drive, he tells his RB not to score, and then makes two mistakes on 3rd down, not either taking a sack or throwing a ball that would've gotten a PI call. It's pretty remarkable how bad Eli was there at the end of the game.
Oh, and he admitted he didn't know how many timeouts the Cowboys had as well. Oh, and he snapped the ball with a bunch of time left on the play clock when time was running too.