There was no roughing. The steps for contact were clear. But..a refs opinion of "brutality" drew a flag.
Much worse did...clean shot and the guy blasts his knees from behind...they should have tossed that asshole.
It was long enough that he knew the QB had released the ball and he could have eased up. He didn't. If it was a sack, it would have been perfectly legal. But not legal on a QB who has released the ball...
Go back (not really) dozens of PAGES and see how many called it ball game 2-3 minutes into the 2nd half.
If it was a tackle this MIGHT have gone uncalled. But the fact that the QB had released the ball made this an easy roughing the passer call. It is what it is