An absolute steal of a deal.
Dermott will be motivated to improve his value for next season.
Leafs get to determine whether he is better than the options already with the team. At this price he's certainly an attractive part of a trade scenario.
Given the likelihood of a compacted schedule, having 6 D with NHL experience signed, Lehtonen in the wings and crushing it, and having Sandin and Lily close to graduating offers the Leafs some confidence and flexibility on the backend. It's not just going to be goalies who are flipped in b2b's this year.
Per CapFriendly:

CapFriendly
@CapFriendly
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5h
To answer the q's wondering how the
#Leafs become compliant, there are multiple options: 1. 21 player roster: 2 players clear enough cap 2. 22 player roster: bury a player with cap >= 1.05M 3. Trade 4. LTIR placement A buyout is no longer an option, their 2nd window is closed