The first flag comes from the line judge, who has just about the same look that we do from the original angle. At full speed, looks an awful lot like helmet to helmet - the defender's head even dips a bit at impact.
The end zone shot clearly shows that the hit was with arm and shoulder; I would have thought it was not a foul, but all three deep officials also had flags on it, so it's pretty clear that the NCAA wants this call.
This actually brings up another point - there were FOUR flags for the same infraction on this play. I know it was right in the sweet spot for 7-man mechanics, but is anybody else wondering who's watching the rest of the field?