In this case it is questionable if they actually wanted to go through with it to that extend. For this to make any sense I'd guess they just wanted the legal status and were forced to go that far to obtain it. Otherwise giving them compensation for an inevitable thing seems rather silly.
Edit: Or they just constructed something out of the disparity between the EU law and the Swedish law, even if the resulting effect is negligible to say the least. Well it's 800 people over 40 years if I read that right (just skimmed), so I doubt it will mean bankruptcy for the Swedish Government.