Contact with an opposing player only overrides goalie contact if the defending player "pushed, shoved or fouled the attacking player into the goalkeeper"
How do you keep touting your knowledge of the rule when you clearly don't understand the rule?
The only way that's not goaltender interference is if Guentzel pushed, shoved or fouled Hartman into Murray. Guentzel did not do that, therefore it's goaltender interference.
That section of the rule doesn't mean that if the attacking player comes into any kind of contact with a defender at any point before coming into contact with the goalkeeper, there's no goaltender interference.
I don't know what else to say to you. It's goaltender interference clear as day.