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"Guile is an implementation of the SCHEME programming language, with support for many SRFIs, packaged for use in a wide variety of environments."

... and Scheme, Common Lisp, Clojure and many others are just lisps.

Dialects of...sure. Definitely not "the one true lisp".

I think it was a joke?

Well the one true lisp of course was given to us by Alonzo Church, that other guy we rarely hear of :)