I don't understand what you're saying. The post you linked to makes a point to say that we should not compare Sweden to its Nordic neighbors because Sweden is actually closer in population weighted density to the rest of Europe. The article calls population weighted density the most fundamental of the arguments it uses to try and separate Sweden from its Nordic neighbors. The post calls the correlation between population weighted density and covid mortality "striking", I assume to emphasize it is a strong correlation. But then it just throws Denmark out as an outlier.
I'm sorry, but when your sample size is 4, you can't throw out one of them and call it an outlier because it doesn't fit the narrative. This sounds like classic cherry picking to me, especially when the narrative is one the author chose specifically to make a comparison favorable to their main argument! For all the submissions on HN decrying bad statistics, you'd think this kind of argument wouldn't fly here.
"We can't compare against the Nordic countries because they are not like Sweden, and we can't use population density because that's the wrong way to look it. Instead we look at population weighted density, and we throw out the one that causes our argument to fail. Then when we compare to Austria, look what a winner Sweden is!"
I understand that there's some merit to the line of reasoning you are presenting, especially population weighted density, but as far as the article goes, to just throw out Denmark as an outlier because to include it would refute the central argument of the article really puts it in a bad light.