We don't usually get slow motion looks at these type plays, but from the live action speed two things seem to stand out; (1) the offensive player does not seem to have firm control of the ball and is moving, in his efforts to gain control. (2) the defenders head, all the way through the contact, seems to be clearly to the left side of the ball carrier's head, suggesting that any contact between the defender and the ball carrier's head would have been incidental, althugh severe.
I didn't sense any indication of "Targeting" or "aiming" that would suggest a deliberate effort to foul. Based on what I saw at live speed, presuming I had the same angle as the camera, I would NOT have thrown a flag.