I think Curtis Yarvin is a master huckster and wordsmith, but near as I can tell what's good about Urbit isn't original and what's original isn't very good. The central concept is basically Java's "write once, run anywhere" concept from the 90s. Remember that? It wasn't just about applets; applets were only the beginning. With "mobile code" that could run on any device, Java was going to make existing operating systems obsolete and finally bury Microsoft.
Sound familiar?
Curtis adds sizzle to the steak by mixing in ideas Hackernews people will find appealing -- functional programming, blockchain, distributed computing -- and finally he plays the same semantic shellgame with his words he plays with his political essays, to convince you that the horrible political views he has aren't so horrible. Except this time it's to convince you that Urbit is more than a reimplementation of interesting ideas from the past, some of which failed massively.
Why? Well, the fact that he is selling "virtual real estate" in his new internet that's totally going to change everything real soon now might be a clue.