The Las Vegas Golden Knights are really pushing the limits when it comes to dancing around the salary cap in the NHL. They have been called out in the past for placing players on LTIR before the trade deadline in order to bring other stars in and be cap-compliant, just to have those players play in game 1 of the Stanley Cup Playoffs. Notably, they have done this with Mark Stone.
The Golden Knights have been called out for these antics in the past, however, under the current NHL rules what they are doing is allowed. It will be especially telling to see just how much the Knights are 'over' the cap come game 1 of the Stanley Cup Playoffs.