There is no generative AI in Beyond the Spider-Verse and there never will be. One of the main goals of the films is to create new visual styles that have never been seen in a studio CG film, not steal the generic plagiarized average of other artists' work.
An important thing to mention is that Miller's statement explicitly calls out generative AI. As the name suggests, generative AI is used to create things such as words, pictures, or videos.
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