In particular, I find it amusing the comment about CLOS using send and smalltalk message passing semantics, xlisp was the last common lisp I remember that used smalltalk style message passing for it's OO, and it deprecated it in the early 90s in favor of a new system before rewriting itself as a scheme instead of a common lisp.

In fact, when we were taught common lisp in '91, we were specifically warned that the xlisp that we were using was an outlier in using messages, and that we should semi-ignore that when we came across a 'real' common lisp variant.