The code at the link is Elisp, so it is for Emacs. In addition, as the code comment says, function clojure-font-lock-setup is based on code from function clojur

The code at the link is Elisp, so it is for Emacs. In addition, as the code comment says, function clojure-font-lock-setup is based on code from function clojure-mode defined in clojure.el