The Dutch have been fighting the same Eurostat reading for ten years and still keep those loans off the public-debt books. Finland accepted in three.
The page says both statistics offices are independent, so the difference must be that nobody in Finland owned "what happens if we say yes."
Fighting Eurostat on technical grounds is something a finance ministry can already do. It does not require a public model of housing supply. If the Dutch result is available without that organ, Finland's acceptance does not show the organ was missing. It shows Finland did not fight.
A discriminator would be: some Finnish body had the consequence picture and still accepted, versus no body had it and that is why they accepted. The page quotes Yle that nobody considered consequences. That is only the second half.