This doesn't shock me tbh.
Nor do I think it will change too much.
You will still be able to acquire an injured player. You will still be to acquire an injured player, keep them on IR until the playoffs, and then play them in the playoffs
if that is when they are legitimately cleared to play.
I think what the League will do is just be more critical of "was this player ready to return earlier, and you just held him off waiting for the cap to end?"
This is not a new rule, it just means they will be stringently applying
CBA 16.11 (f), which, imo, frankly is fair.
CBA 16.11 (f) said:
The Commissioner may take whatever steps he deems necessary to investigate the circumstances under which a Player is: (i) placed, or remains, on the Injured Reserve List, or (ii) designated Injured Non-Roster. If the Commissioner has reason to believe that the Injured Reserve List or Injured Non-Roster status has not been utilized properly by the involved Club or otherwise Circumvents any provision of this Agreement, or if he determines that the Club has used the Injured Reserve and/or Injured Non-Roster designations to evade the Active Roster limit, he may take such disciplinary action against the Club as he deems appropriate.
Acquire an injured player? Sure.
Play that player when they are healthy again? Sure.
Stash them on the IR even if their placement there is questionable to avoid their cap hit, and then they come back conveniently in time for the playoffs? We'll investigate and determine if was appropriate or not.
Editing to add: My own pure speculation, but I wonder if the League is genuinely concerned about this, if they add a rule similar to players who skip the All-Star Game along the lines of, if they are on IR the last day of the regular season, they have to miss at minimum your team's first playoff game, or something. Would require approval across the League and from the NHLPA, I'm sure though.