At this point, I'm (technically) the guy who runs it.
Back when we started it Universe Factory in 2015, we had a whole lot of activity - lots of interest, lots of authors, lost of posts. People gradually drifted away, in many cases from Worldbuilding Stack Exchange itself, something that was exacerbated by a network-wide crisis this past fall (see here for a bit of a timeline). Most of the most prolific authors have left over the last couple of years, and while we still get some submissions once in a blue moon, it feels a bit like a ghost ship. I've had an idea or two floating around for a bit, but I can't guarantee it'll become anything coherent anytime soon.
That said - we are open to new authors, new posts, and new ideas! Periodically, I've thought about putting together a meta post asking for new submissions, and if new users like yourself are aware of the blog - well, maybe there's enough interest. What I can say is that we would love to get new (and old) voices in. It's just a matter of figuring out how the heck we do that.