The only one of the so called Danish physicists quoted in the article is Andrew Jackson who is American. I believe this is the paper it all relates to: https://arxiv.org/abs/1706.04191 None of the authors are Danish, but most are related to the Niels Bohr Institute.
Andrew Jackson probably has a lot of Danish colleagues at the Niels Bohr Institute, which of course is in Copenhagen, and many of them might agree with him and some might have been involved in the study. He probably also lived in Denmark for many years and he might even have gotten Danish citizenship, family and he might even speak Danish. The same might apply to some of the other authors.
But you wouldn't call Einstein a Swiss, Austro-Hungarian or American physicist although he did most of his important work in those countries (and actually obtained both Austrian and American citizenship), would you?
I am aware of the Copenhagen school quantum physics/ the Copenhagen interpretation, and that the article might try to play on that old thing in the hopes that we might see a new Danish school in physics. But why?