Bart, The point of the article is that the cases are going down in Sweden rather than up as it is in the rest of Europe. So maybe Sweden is developing a form of herd immunity that will pay off dividends.
So, maybe you haven't been paying attention?
Sweden only recently started going down, whereas other countries were already down for a while. Those who have been down in the infection ratings for a while, have been reopening their economy by relaxing the restrictions, and
as anticipated that made the number of infections go up again, to a degree. But now there is a much better grasp on how to control the outbreaks, and they are unlikely to overwhelm the ICUs.
We're all far far away from achieving herd immunity. Things will be getting worse everywhere in a few months because there is no vaccine yet, and people are too impatient to stick to the proven concept of social distancing (or masks if distancing is not possible) and personal hygiene (handwashing with soap and disinfection).