If referring to this sentence: "Examples are the programming languages Clojure, which is a contemporary dialect of Lisp, Rebol and Refal." Perhaps it's just poorly worded, but the intention seems to be to list each of those languages as being homoiconic, with an aside that Clojure is a modern Lisp. Maybe some parenthesis are in order, heh ;)
I think you're misreading that sentence. "Examples are the programming languages Clojure, which is a contemporary dialect of Lisp, Rebol and Refal.", which claims that Clojure is a dialect of lisp (indisputable), rather than Rebol. Rebol is just another example of a homoiconic language.