From the page...
This page is the official page for the movie, sanctioned under CBS, Viacom, and Paramount (where applicable). We apologize to any fan pages who received a relinquishing letter and were startled by it. It's part of the introductory process when we release an official page.
Hm, I'm not seeing where that appears.
Wait. Got it.
Still, though, I'd be a little more assured about authenticity if there were something like that in their "About" section, along with a linkback to Paramount or to a Paramount page for the film. So far, this seems a bit amateur.