It seems very clear to me that targeting criteria was met. The receiver was defenseless (2nd bullet under Note 2) and the 3rd bullet of Note 1 was fulfilled by the defender. And while I don't see a question in this case, also the rule reads "When in question, it is a foul."
ARTICLE 4. No player shall target and make forcible contact to the head or neck area of a defenseless opponent (See Note 2 below) with the helmet, forearm, hand, fist, elbow or shoulder. This foul requires that there be at least one indicator of targeting (See Note 1 below). When in question, it is a foul (Rules 2-27-14 and 9-6). (A.R. 9-1-4-I-VI)
Note 1: "Targeting" means that a player takes aim at an opponent for purposes of attacking with forcible contact that goes beyond making a legal tackle or a legal block or playing the ball. Some indicators of targeting include but are not limited to:
- Launch-a player leaving his feet to attack an opponent by an upward and forward thrust of the body to make forcible contact in the head or neck area
- A crouch followed by an upward and forward thrust to attack with forcible contact at the head or neck area, even though one or both feet are still on the ground
- Leading with helmet, shoulder, forearm, fist, hand or elbow to attack with forcible contact at the head or neck area
- Lowering the head before attacking by initiating forcible contact with the crown of the helmet
Note 2: Defenseless player (Rule 2-27-14). When in question, a player is defenseless.
Examples of defenseless players include but are not limited to:- A player in the act of or just after throwing a pass.
- A receiver attempting to catch a forward pass or in position to receive a backward pass, or one who has completed a catch and has not had time to protect himself or has not clearly become a ball carrier.
- A kicker in the act of or just after kicking a ball, or during the kick or the return.
- A kick returner attempting to catch or recover a kick, or one who has completed a catch or recovery and has not had time to protect himself or has not clearly become a ball carrier.
- A player on the ground.
- A player obviously out of the play.
- A player who receives a blind-side block.
- A ball carrier already in the grasp of an opponent and whose forward progress has been stopped.
- A quarterback any time after a change of possession A ball carrier who has obviously given himself up and is sliding feetfirst.