I had the same feeling from the video, and a feeling of foreboding from the moment Blackstar was released - I sensed he was contemplating eternity and life, the really big questions, the sort one does when they know the end is near (or in my case - when you’re living in both Hong Kong & Shanghai, but seeing the death of a deal in terms of “one counry - two systems” unfold before your eyes). I analyse his lyrics (& “Cosmic Life”) as Asynsis, here:
http://genius.com/David-bowie-blackstar-lyrics

https://medium.com/@ASYNSIS/cosmogaia-2ffa281c73d#.2r7sixx86