Scribe
Legend
Both Cavill's supposed love of the books and sexism seem to be exaggerations of the same grains of truth. For example, the female showrunner the show did say Cavill often had lore points to add in and little things to suggest, but that Cavill was extremely polite and never pushy about them (she was specific). Different groups exaggerated different parts of these truths, to try and make Cavill into either a sort of Incel-Hero figure, fighting the brave fight of being a misogynist ultra-nerd, or Cavill into a sort of Incel-Villain who hates women and obsessively attempted to push lore. And this whole "Oh he quite because he is a PURE TRUE NERD and couldn't stand what they are doing!" seems like pure fantasy to me. I'm pretty sure he quit because they cast him in a new Superman movie (which then fell through).
Somehow I don't think a dude who looks like that and has the GFs he does is really on the side of the incels nor is a guy who did three series of The Witcher going to quit for the fourth just because of "lore problems".
The dude is just a legit lore nerd from various interviews, who would fall on the 'canon does matter' side of things from what I've seen.
Painting him as a misogynist (not saying you are) is a pretty good attempt at a character assassination.