It is not clear from Mr. Kirby's article who the official in the office of Dr. Gerberding was that sent the email or whether that official's view represents the official view of the CDC. But it seems consistent with the autism research paradigm shift proposed by the University of Minnesota:
The Autism Knowledge Revolution has been marked by dramatic advances in our understanding of the structural and genetic bases of autism. The autism research paradigm shift, a shift toward investigation of the interaction of genetic susceptibility and environmental triggers may well speed the pace of that knowledge revolution.
Reactionary bloggers at the Autism Hub and Neurodiversity ideological movements will not be happy with the autism research paradigm shift but the maturing of scientific inquiry into autism, the movement past official defensiveness, may someday result in more effective treatment and cures. And those are autism realities that will be happily embraced by most parents of autistic children.