But] philosophy continually leads experts with the highest degree of epistemic virtue, doing the very best they can, to accept a wide array of incompatible doctrines. Therefore, philosophy is an unreliable instrument for finding truth. A person who enters the field is highly unlikely to arrive at true answers to philosophical questions.

Philosophy hasn;t been very successful at finding the truth about the kind of questions philosophy typically considers. What's better...at answering those kinds of questions? You can only condemn philosophy for having worse methods than science, based on results, if they are both applied to the same problems.