It’s never been about lore accuracy. It’s about accuracy to their individual subjective historic reading or thinking about a text. When a book gets adapted to a film, it’s natural to want it to be like you imagined. What they don’t understand is that if it isn’t, that’s not necessarily because it’s inaccurate to the text. The reader might not have had the requisite general understanding to put the text in context.

In practice even this is a very charitable view of the people complaining. Usually it’s literally just that they imagined it with more cis white people and traditional gender roles. That’s if they even truthfully engaged with the source material they pretend to champion, and aren’t just people with an agenda trying to dupe fans