I don't know how I missed the Ancient Moonstone Dragon, so that confirms its not a Template. You notice what IS missing from that list? Ancient Deep Dragon.
So either Ancient Deep Dragon is a lower CR then Ancient White Dragons (unlikely, although Ancient Faerie Dragons would make sense being alot lower CR), it's an accidental omission, Deep Dragons don't have ages, again very unlikely as they've always had them before, or most likely Deep Dragons are a Template like Shadow Dragons are which is hugely interesting change.