It seems a to me like that's what Marty coaches because the whole team seems to enter the zone that way. Gain the blue line, stop at the wall, protect the puck and wait for reinforcements. Though I'm not sure Slaf has that kind of rushing ability in his arsenal.
In any case, inside rushes are getting rare across the league except for elite players because they are low-percentage plays. 4 nations was a perfect example of the direction the league is going : most players either dumped or stayed in the perimeter when crossing the middle of the ice because even though it doesn't create a scoring chance as often, it's a high-percentage play that keeps possession and moves the play towards the opponent's net. That is winning hockey and it's the way the Habs play when they win.