Hi, it's usable in a sense. the repo migration kept the important namespaces in the old project, so the old documentation should still work in some cases. The major change is the new "main" namespace is typed.clojure, though clojure.core.typed is still included in the new project. In another sense, there are no active users or much of a community to speak of. Some of the issues that plagued core.typed are still present, but others are fixed with new approaches (eg., typing rules for macros). I've averaged around 2-3 months a year developing it for the last few years.

But the old docs need to die. I put all my time into coding unfortunately.