The 2021-22 Maple Leafs that posted a record setting 115 points regular season surrendered
253 goals against which ranked them
9th in the Eastern conference and tied for
18th overall.
The 2017-18 Maple Leafs that posted a record setting 105 point regular season surrendered
232 goals against which ranked them
3rd in the Eastern conference and tied for
10th overall.
Leafs surrendered +21 more goals against last year and dropped +6 spots in the East and +8 positions overall in the standings. Leafs aren't getting better they're getting worse defensively over time.
Some people like to pretend the Leafs are getting better defensively, and back it up with pretend stats but Actual pucks in net tell a very different story over the last 4 years in comparison to record setting seasons.
If you allowed only the top 8 best defensive teams per conference or top 16 overall into the playoffs based on factual goals against then Leafs wouldn't even qualify for the playoffs.
The 2021-22 TB Lightening surrendered 233 GA this year, so when defense and goaltending won out it shouldn't be a surprise to anyone.