Basically yes. I didn't read the paper, but the abstract says that our current recommendations were designed to get us past a threshold of 50 (nmol/L, but the units aren't that important).
But they claim that we should be aiming to get above 75, and it would be best if we could get above 100. So drink more fortified milk.
Edit: oops, looks like I read it wrong. 50 nmol/L isn't the threshold the current RDA gets us to, it's way lower than that.
You would need to drink over 4 gallons of fortified milk per day to get the recommended 8000 IU. Milk just isn't fortified enough, because the current daily recommendations are so low.
Leave some mushrooms out in the sun, gills up, and enjoy ;). Though you may want to calculate it out first. This research survey at least makes me more confident in taking larger doses of vitamin D.
I assume the article is about milk since it's very common to drink milk in Finland. I'd wager most adults drink milk both with lunch and dinner as long as it fits the cuisine.
But they claim that we should be aiming to get above 75, and it would be best if we could get above 100. So drink more fortified milk.
Edit: oops, looks like I read it wrong. 50 nmol/L isn't the threshold the current RDA gets us to, it's way lower than that.