They may know everything about you right now. But they don’t know about your future self, how you can change, how you may be an entirely different person in as little as a year. Data is useful, but it is more useful the more updated and recent it is.
My thought is maybe either food or arms or research for arms production/nukes from the Russians.
Edit Addendum: the article says as much actually lol. This is what I get for just trying to get an idea of NK actions from the title.