I have never seen devine mention where he hosts his website, and haven't come across a uxn web server so I think the answer is "no", it's not hosted on uxn.
Would be cool to have a web hoster that follows some of the principles layed out by uxn/100r and see what kind of service would turn out.
I guess being extremely productive and successfully pushing new and exciting concepts in computing also means you need to adopt a certain level of pragmatism.