Well, because Clojure actually has a "proper" REPL. Non-lispy languages don't have such REPLs, at best - they are interactive shells. The blogpost author doesn'

Well, because Clojure actually has a "proper" REPL. Non-lispy languages don't have such REPLs, at best - they are interactive shells. The blogpost author doesn't seem to have experience with homoiconic languages, otherwise, I'm sure, that sentence would be different.