To continue my thoughts from the GDT, this is the way they ruled it:
A) It was a distinct kicking motion that played the puck towards the net, however that's legal in all zones unless it causes the puck to be propelled into the net.
B) It did not "deflect" off Hellebuyck's stick into the net, it was "propelled" by Hellebuyck's stick into the net (the rules use the verb "propel" all over the place to be distinct from "deflecting" the puck. This renders the ruling that the puck was kicked irrelevant.
I actually disagree on both accounts, however when you reverse it that way... it still results in a good goal.