He wasn’t able to articulate that. He just kept saying that he could teach me, but that’s just probably because he wasn’t prepared for a thrashing of hard questions that he may not have considered when trying to get people of moderate intelligence to join his cult. He seemed to not understand that a lack of brain function likely means you’re dead or in a vegetative state. If you have any awareness whatsoever, you have thought, and you exist. Which, IMO, thoroughly disproved that he disproved Descartes.