I was sort of hoping for another in-depth interview, but was disappointed to see that this was a video. For highly technical information, video is way too low-bandwidth a medium for my tastes; I prefer to read. Oh well.
That is correct as far as I know, but not a fine enough granularity. Walter Bright designed and implemented D. That version is commonly called D1. Andrei Alexandrescu, however, worked with Walter Bright on the design of D2, which is now what most people mean when they say "D".