He went facemask to facemask which is helmet to helmet. It's going to get called every time, at least when it comes to a defender attacking a quarterback in drop-back posture.
Is it annoying that a penalty not called on the field, can be originated by a replay? Yeah, sure. Is it for the safety of the players? Also, yes.
But this one is still tough for me-- if the defender drops his body to bring his helmet down toward the QB's chest, then two problems can arise-- first, simple physics dictate that the defender's head is still likely to slide up the QB's body as the QB falls backward, and head to head contact will almost inevitably still be made. This is something we see often, and we see it called targeting often. Second, the defender really has no choice but to take his eyes off the ball, and will lose his chance at recovering a fumble, deflecting a pass, or any of the other stuff he's supposed to do.
So effectively what the rules are legislating, is that a defender probably can't sack a QB in this type of scenario, without drawing a penalty and/or losing track of the ball.