I don't see these contradicting each other. I'm also a huge Rich Hickey fan (my main language is Clojure at the moment), and he certainly has emphasized the benefits of a broad base of knowledge and experience in various talks.

But here he is saying that you can't only explore the breadth of programming, you also have to dive deep at some point and get the experience of mastery in something. I can't see either one disagreeing with the statement that you want to have some breadth of experience first but that mastery only comes afterwards from focus.