That's funny stuff there, but here is the rule for what counts as hitting defenseless person:
Forcibly hitting the defenseless player’s head or neck area with the helmet, facemask, forearm, or shoulder, even if the initial contact of the defender’s helmet or facemask is lower than the passer’s neck, and regardless of whether the defensive player also uses his arms to tackle the defenseless player by encircling or grasping him
The rules are the rules. They might not be consistent in their application, but in this case a good argument could be made that they got the exact call wrong (helmet-helmet), but that is sort of nit picking. Either penalty is the same consequence.
But yes, that freaking sucked.