Clojure will affect the way you think about programming
If "expanding your brain" is really what we want to optimize, why not learn Haskell?  Or for that matter, why not learn something even more strongly typed, like Agda or Idris?  Or even a theorem prover like Lean?Most of the reasons the author presents would either be expanded in one of those languages, or is immaterial to the goal of maximizing learning.  After reading the article I have no more reason to consider learning Clojure over learning any of the languages above.