I don't know if Klingberg is actually injured or if he's just the latest example of a team taking advantage of the LTIR loophole to get out of a cap squeeze; either option seems entirely plausible.
What I do know is that there are enough situations like this, where teams take advantage of LTIR to ice rosters that are above the cap, particularly in the playoffs, that its something that needs to be addressed; especially since 3 out of the last 4 cup winning rosters were above the cap in the playoffs.
And for those saying it's definitely a legitimate injury - I'm not sure why you'd be so sure, especially since the Leafs have been 'caught' putting guys on LTIR who could have played. The most obvious example being Joffery Lupul, who was put on LTIR after failing a physical but then posted photos of him backcountry snowboarding with the comment:
"“Haha failed physical? They (Leafs) cheat, everyone lets them.”
https://globalnews.ca/news/3753955/r...for-leafs-nhl/