As the article states, Denmark, while having high taxes, is very business-friendly: Very little bureaucracy, almost zero corruption, English-speaking population, relatively cheap apartments ($1,850 per month for a newly constructed two-bedroom apartment in central Copenhagen) and very low expenses of health care and firing people. Also, while wages are generally very high, they're not high compared to Silicon Valley…
Denmark has high taxes for the poor and middle class, relative to the US, but taxes on the rich aren't really much higher.
Ironically, there's virtually no place better to be "poor" than in Denmark, because while poor people pay taxes, too, wages (and welfare) are so high that they end up living a better life than in other countries.
Taxes on the rich are a different story, though, because while the tax rates on the rich may compare to those in the US, it seems to me (and I might be wrong here) that, through tax deductions and various other things, rich Americans often end up paying relatively low taxes. And that would be hard to accomplish in Denmark.