“Children often, often ask me how much of the ***magic*** is in inverted commas “real” in the books in the sense that did anyone ever believe in this? I would say - a rough proportion - about a third of the stuff that crops up is stuff that people genuinely used to believe in Britain.
Read and learn: She just gives a thorough answer to the question, the topic isn’t “turned” to magic, the topic is mythology and folklore in the stories. Magic is part of mythology and folklore as well as the occult, in fact that’s why cultists like to wrap themselves in mythological trappings, it gives them the appearance of antiquity which helps them hide their BS. But since the question is about mythology then the magic in the answer would, logically, follow that context and be mythical magic not occult magic.