I wonder if they were simply stating that their role is with regards to the physical organization and release of the documents, but nothing beyond that?
You know, it's entirely possible that Britain is releasing only some of their research but telling the world that this is everything. For example, maybe this is all the "secret" stuff but not the "super secret" stuff, nor the "super duper secret" stuff either.
In the immortal words of Donal Rumsfeld: we don't know what we don't know...