Rian just posted this series of images on twitter a few hours ago.
I’m betting Pablo or someone in the story group handed him those books when he was writing the script. The handling of the Force in the film always sounded very accurate and informed from an EU perspective to me. Though I never got around to reading those specific books(THE SACRED TEXTS).
I’d like to see the “Legends” banner replaced with one that says “the SACRED TEXTS”