I am pleased the article is about Alejandro Jodorowsky’s Dune rather than David Lynch’s version (which I recommend with a few caveats regarding limitations, style and the times). That said, there’s a documentary with more detail called Jodorowsky’s Dune. See that. If you like that doc, try Lost in La Mancha, which is a Gilliam doc on failing to make a movie. For Jodorowsky, I’d suggest Sante Sangre. Maybe see El Topo, too (and first) if you don’t mind art cinema.