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…
How does that translate to software startups? I haven't seen many on HN, for whatever that means.
European software startups that need a huge infusion of capital tend to move some of their business to Silicon Valley while sometimes maintaining a development department back home (e.g., Unity is now headquartered in San Francisco while having its chief development department in Copenhagen, AFAIK).