I have a few LPs that indicate they were digitally recorded, but obviously they are analog media. I don’t recall that there was any discussion of clock rate or bit depth on those discs.
I have many optical discs that are AAD, because they are digital distributions of an analog recording and mix.
I don’t recall seeing any DAD indicators, but of course, it’s possible. There are producers who feel that a pass through analog tape adds something desirable to the finished product. YMMV. Old multitrack session tapes could certainly be used in an ADD distribution.
What was the first DDD? I have no idea.