It's very close - and I'd totally understand and support the on-field crew if they called it - but it appears to me that the initiation of contact was just at or below the shoulders. The head snapping back appears to be from the rapid redirection of the torso, not a direct hit. Probably would overturn a call on replay - but not definitively saying I would, pending other angles.
Even if not called, I would coach that player that he is placing himself at the whims of bad fortune if he insists on walking that close to the cliff.