Yes, it is official. Rock River Arms no longer offers the BodyCote Diamond Black finish. It is unfortunate, as the finish is beautiful and durable. But the decision was made in the interest of customer service. For that we should be understanding, if not appreciative.
I've been researching bodycoat and have found the metalurgist coporation that does it - they're actually all over the place and its called a BodyCote treatment process. They have referred me to one of their eastern locations and implied I could sent a frame, slide, or whatever for the treatment if it is appropriate for the type of metal. I don't think this is something that can be done to aluminum - could be wrong though.
I haven't spoken to the east coast operation yet but I must admit I love the look of that bodycote finish!