I'm not sure you have a good grasp on what you're talking about. Sweden has one of the highest death rates per capita in Europe,and the absolute worse in nordic countries.
https://www.bbc.com/news/world-europe-53498133
The strategy followed by the Netherlands is to quarantine everyone who does a covid19 test, and get anyone feeling any symptoms to get immediately tested.
https://www.government.nl/topics/coronavirus-covid-19/tackli...
More importantly, the strategy followed in the countries you've mentioned was to intentionally let the disease spread in a way that didn't overwhelmed health services. While the rest of Europe is intentionally trying to completely contain the disease, the strategy followed by Sweden consists of letting it spread freely as long as they can claim their health services aren't overtaxed.
In my opinion that approach is idiotic because currently the best thing health services can do to a critical covid19 case is linger around while watching the patient die, thus what's the point of bothering about if a health service has enough beds to fill?