That sounds nice, and all, but I call bullshit. First, if they were contractually obligated to keep their raw data secret, they could simply say so, instead of just stonewalling FOI requests. Feel free to post copies of the contracts and prove your assertion. Second, if they had the evidence -- the raw data -- that would shut the mouths of "deniers" once and for all, they'd release it in a heartbeat for the very reason you cite that they don't.
The bottom line is that the fact that we still don't have the raw data sets WEEKS after this story broke is damning. Either they don't have it, or they know that it doesn't show what they SAY it shows and are simply trying to avoid exposure, or they are cooking the books (some more?) to support their theories before releasing it. There's absolutely no excuse to not just simply but EVERYTHING on the table at this point, and let EVERYONE, professionals and "amateurs" alike, have at it.