Honestly, he's probably the worst judge of whether he made it or not. He was putting his head down and driving -- and then was driven back. He really had no way of knowing how far he'd gotten. That's the linesman's job, and he got it right, even if he did hesitate.
He didn't get in.
The linesman made a bad call.
The reviewing official did not have sufficient evidence to over turn the call.
Steelers TD.
Even if he didn't get in on that play, they were going for it on 4th down and probably would have gotten in anyway.
Honestly, the Hawks' whining is nothing compared to Steeler's fans whining about the Hawks' whining.
The Hawks wouldn't have won, anyway. They were not making any plays while the Steelers were making enough plays to win.