The specific lie is that when the questioner says “mythology” and the answerer says “folklore” you scream “OCCULT”. Neither of them said any about the occult, that’s YOUR insertion that YOU insist is proven by that quote but is in fact not there at all. They’re different things, somewhat related sometimes but in general separate.
Good luck with that. I don’t think he’s teachable.
You know full well that JKR turned the topic to magic. That was the context of her 1/3rd statement.