If true, this would be a minor mindfuck for a massive Beltrami fan like me. However, I do prefer to be cautious, as people making false or exaggerated claims on internet isn't exactly unusual, and as DarkerKnight pointed out, this does sound a bit on the outrageous side.
I mean, Beltrami has his own studio and works on a reasonable number of scores every year, plus contrary to Hans Zimmer he is definitely not a 'brand'. I don't think his name on a CD makes it sell outside of the film music fan community. So except if Trumpp, Sanders and Roberts are pathologically shy people, I really don't see any reason for such quasi-total forsaking of credit in favor of Beltrami.

Bottomline, I'll need more proof on this one.