As I originally posted this to HN, I must say that the claims in the article don't hold on closer inspection. I shared it too quickly without checking facts and thinking it through, shame on me on spreading misinformation.
As the author of the article, I share your concerns.
I asked Vesterbacka for comments when I posted the first version, but he only responded later this afternoon. (I'm now waiting for feedback from the Marketwatch/WSJ reporter where the claims originated).
If you've followed the post, you'll see that I updated it regularly in the course of the day with information from this thread, with a window of a few hours where unfortunately I couldn't update the post because the site went down.
Good commentary about the claims: http://bgr.com/2013/02/11/rovio-revenue-debunk-324583/