The only people I've seen use the elbows on bars position in real life are audaxers. They're possibly contravening some road traffic law anyway by not being able to reach the brakes, but I guess that would have to be argued in court. On the occasions I've seen it, I wouldn't say it was dangerous; on quiet roads and not following other riders. In fact, I thought this was standard Dutch transport rider position into a headwind?
As an aside, that article is really badly translated!