He has since started tweeting again since the website went down and has yet to address it.If I had to guess it's caused by something technical expiring or fucking up since that's what happened to his forums. The real question is whether he'll fix it because he didn't with the forums (and confirmed on a stream that he didn't care). But in fairness he didn't develop the website - it was done by his friend Marc Swint.
So... yeah. Unless things change, it looks like the website is gone for good.