Originally Posted by _Richard_

41.1 Boarding ? A boarding penalty shall be imposed on any player or goalkeeper who checks an opponent in such a manner that causes the opponent to be thrown violently in the boards. The severity of the penalty, based upon the degree of violence of the impact with the boards, shall be at the discretion of the Referee.

Interference (ice hockey), the penalty where a player impedes the movement of another player who does not have the puck

the NHL doesn't 'agree', unless as in this case, the NHL decides to ignore it's own rules