Agreed but probably deserved for that shocker of a no arms tackle at the end. That should have been a straight red.
The initial contact was the chest and there were 2 other tacklers involved. Straight red or yellow, given there were 10 seconds left, it was irrelevant. The whiplash made the hit look worse than it actually was, but not nice.
Judicial process will decide if there should be a sanction.
Japan really unlucky to have their 10 removed for the HIA when they had the late kickable penalty that he would have slotted.