If you push someone into their own goalie it’s the same as if you hit the goalie. So they blew the call. Maybe they felt it was just a live tap.
the official line that it wasn't that hard just doesn't wash. The rule is supposed to protect the goalie. I don't think you call it like it was a bump of wing in a corner digging for a puck. No contact in the crease should be a bright line, but I guess Toronto doesn't call it that way and the refs aren't going to overrule themselves.
The play was series-determinative. Yes, it was only the tying goal, not the go ahead, but with the penalty attached and the extended power play, the follow-on goal flowed from it. The Bs weren't going to get another goal, so instead of a possible 2-2 series with Panthers having the home ice edge, it's 3-1 with only needing one more with 2 of those games in Florida. The Panthers are the better team if the B's can't score, but the Panthers didn't need a bad call to win the series.