Where is that number coming from though?
The link in the article for the alleged source just links to a heat map with no actual numerical data in it. And that heat map shows a higher rate for Spain than Sweden.
edited to add:
I found another article that states the following:
Scandinavia’s biggest economy will shrink 7 per cent this year, Finance Minister Magdalena Andersson said on Tuesday. And while overall deaths are on the decline, Sweden’s had 6.25 deaths per million inhabitants per day in a rolling average between May 12 and May 19, according to Ourworldinsata.org. That was the highest in Europe on a per capita basis and just above the United Kingdom, which had 5.75 deaths per million.
Sweden in deep economic crisis despite soft lockdown, as per capita deaths rise
If the article linked in the OP is comparing the same sort of thing, it looks like they are just looking at the recent fatality rates.