In any way shape or form that amount of forceful contact to the head is a send off every day of the week.
Did he intentionally go out to target the head? No. Suali'i Was looking to shut down the threat of Walsh on the sweep who had already created the overlap, was obviously looking to stop it before he could get the ball away hence why he went in like a missile......his target area was high to stop the ball from getting away.....however at that speed your setting yourself up cause if your off your target by millimetres or the ball carrier lowers by the same amount you get what happened........and these days it doesnt matter if your 6 feet or 2 inches from the ground, the head is sacrosanct.
Not intentional but a misjudgement by Suali'i, send off the only call that could be made from that.