Forget Deep Down, just look at SE's own tech demos that never really turned into anything as an example of them showing things that never really turn into what you're thinking. 2012 tech demo: Agni's Philosophy
It's a tech demo. It was never meant to be game. Project Athia is a game. Project Athia has been in development since SE cancelled the last of FFXV's DLCs. This thread has absolutely no basis to exist.
By the way, What were the other gens vapourware?