99.9999% of modern occultism never gets anywhere near this level of sophistication and brilliance.
Gygax, Gary (July 1977) “Planes: The Concepts of Spatial, Temporal and Physical Relationships in D&D” The Dragon #8 TSR I (8):4
There’s a whole lot of people who want to convince you that D&D is not a gateway into occultism. That may be true for them.