What happened to XEmacs?

I used XEmacs quite a lot in the 2000s before I switched back to the more stable GNU Emacs. That was back when XEmacs offered a stable official Windows build before GNU Emacs did. At the time I was doing a lot of development on Windows, and having my favourite editor available was important. Obviously this is still important but my favourite editor has changed somewhat in the meantime.

Out of curiosity and for some research I tried to look into the current state of the project and found that the site www.xemacs.org appears to be unreachable. The domain still exists and according to whois was last updated in September 2015. The XEmacs Sourceforge page is still around, but appears to have received its last set of updates in 2009. Most of links to the bug tracker, mailing list hosts etc are dead as they’re point to subdomains of xemacs.org.

Anybody know what happened to XEmacs? The only reference I found was a post from January 2016 on a website I’ve never heard of (8ch.net). It references a post on the XEmacs development that I can’t get at anymore because lists.xemacs.org is dead. That post suggests XEmacs development is officially dead now.