I think that it is a partly historical note. Back in the 1960s and 1970s AI was more symbolic and logic processing. Prolog evolved to handle rules, etc. These

I think that it is a partly historical note. Back in the 1960s and 1970s AI was more symbolic and logic processing. Prolog evolved to handle rules, etc. These days AI is more about extracting correlations from masses of examples (an obvious oversimplification). I doubt there is much Lisp in use by modern AI/ML systems.