Think of it from our perspective: unless you follow his streams, there has been no progress update. No new screenshots in years, the website is down, no talk online anywhere except for Twitch which you have to be watching at exactly the right time to hear any news, etc.
I am sure this guy is a good programmer, but because this demo came out twelve years ago I am not hopeful that it will *actually* be released. It seems more like his "forever project." A white whale that will never be caught.
Sometimes things like this happen. Someone starts a project and works on it for years without ever finishing it, trying to reach perfection. It's always sad when this happens, but it's a more common story than not.