Although comic book lore has a canon defined by intellectual property, the topics they explore tend to be interchangable fictions. That is: there are a lot of characters that have superpowers, characters who drink magic potions or elixirs, and characters who use these things to avoid death. Sometimes these things are defining backstories, other times they are alternate continuities, non-canon one-offs or fanfic posted on Reddit. Because GPT is inferring a "plausible next guess" for any particular piece of knowledge, the likelihood that it understands the specific causal relationships and their valuation is very low: Psylocke is a type of comic book character, therefore the ability is because of <a type of comic book event>, not <the specific event in issue such and such>.
GPT does similarly poorly if you ask it historical questions like "who were the most influential art educators of the 19th century?" It will respond with a jumble of people from different eras and books that those people did not write.
GPT does similarly poorly if you ask it historical questions like "who were the most influential art educators of the 19th century?" It will respond with a jumble of people from different eras and books that those people did not write.