It sounds like he's criticizing Lisp for being prone to monkey patching, which would be a very poor understanding of metaprogramming in Lisp. From what I've see

It sounds like he's criticizing Lisp for being prone to monkey patching, which would be a very poor understanding of metaprogramming in Lisp. From what I've seen Lisp ends up being perfectly clear about what is being called in what context. Clojure is especially clear with its namespace feature.