PA's point is that if the Shark who was hit did not touch the puck he, technically, is not in possession and that the hit, technically, is interference.
It definitely is a gray area because while the video shows the player moving his stick over the puck, he doesn't appear to touch it before being hit. Technically, it should have been a penalty, but the gray area is whether he could have possessed or controlled the puck before being hit. He certainly could have and he was most likely intending to until he noticed McNabb bearing down on him.
As I pointed out, there were weird gray-area calls about possession and off-sides throughout the season where a player "with" the puck entered the zone although they hadn't touched it, one leg was on one side of the line, etc. etc. You can also call goalie possession of the puck and whistles to stop play a pretty gray area, too.