Rich Hickey had nothing to do with it. He did put a lot of the initial work to get Clojurescript up and running but for many years the majority of cljs maintenance and shepherding was done by David Nolan. Not sure now; I've been out of the loop for years.

The Clojurescript community was the first group adoption of React outside Facebook (early on they had community news blog post and mentioned it) but that because the React rendering model fit the Clojure data model. I was active in the NYC Clojure meetup at the time (Rich was from upstate and would only come in for big announcements, and David was local) and we had 4 or 5 months where there was active discussion among the web devs after the talk on how to make cljs actually work. My memory is Brandon Bloom is the one who made the React connection. David picked up the idea and promoted it to the wider community.