Basically, the article is saying that they've achieved herd immunity. Is that correct? As soon as a month ago I believe the consensus was that they were far away from it, with the total percentage that have antibodies somewhere around 15%.

They also have significantly more deaths per capita than all but 3 EU countries (Italy, Spain and Belgium.) That said, I definitely don't think a country's deaths per capita necessarily indicate doing something totally wrong. Belgium, for example, has the 2nd worst number of deaths per capita - literally ten times more than many other EU countries - but they weren't materially different than their neighbors in their strategy, and indeed seemed to lock down harder...