What he is saying is precisely Behe’s point in Darwin Devolves. Cell evolution is mostly about destroying complex equipment that hinders immediate survival. (The question of how the equipment came to be so complex beforehand is separate from the question of what life forms actually do when they evolve.)
So cellular evolution is not the assured result of settled science, as we’ve all been told. Well, it certainly did sound more like a catfight over there. With a similar respect for facts.