Is there any job security for tenured academics in Denmark?
I have recently been employed at University of Copenhagen in a temporary position. The current situation is definitely problematic.

Denmark has the general problem (shared with many other countries), that basic funding for universities has been cut over many years, and transferred to project specific funding for research centers or individual grants - more often than not provided by private companies and foundations, rather than the state.

This means that the extraordinary circumstances have become rather ordinary, and the case of prof. Thybo mentioned in the article, is not the only known case. Adding to this that many younger people are now being hired in assistant professor positions without tenure, although being at the age and reputation where they should really get tenure track positions or tenured positions, it certainly seems that University of Copenhagen is phasing out the concept of tenure.

To summarize: I think the conclusion that there is no job security at all in Denmark is rather harsh, but definitely not without reason. I would recommend anyone aiming for faculty positions in Denmark in general, and University of Copenhagen in particular, to do solid research into the financial situation of the department they are considering joining first.