Depending on the level or lockdowns, that can be due to things like less traffic and people staying home, thus less deaths associated with activities forgone.
Another significant factor was the complete elimination of flu as a byproduct of COVID countermeasures (zero recorded flu cases or deaths for about a year). Flu came back in from overseas (with a vengeance) when the restrictions lifted.
Even so, it saw much higher mortality rates than its neighbours.
Did they?
https://twitter.com/JamesMelville/status/1596815870676041729
Actual studies of the COVID death rate in the Nordics all show Sweden having a much worse mortality rate.
[0] https://journals.sagepub.com/doi/full/10.1177/14034948211047...
[1] https://journals.sagepub.com/doi/pdf/10.1177/140349482098026...
[2] https://jogh.org/2022/jogh-12-05017
[3] https://www.statista.com/statistics/1113834/cumulative-coron...