The Witcher and RoP and Ghostbusters are all different movies/shows. You can't really take ones complaints and apply them the others as though they're the same complaints.
Take any competitive game for example. Every competitive video game will have people in the forums complaining about balance in one form or another. On the surface, you could take that as being 'the same complaints', but it'd be quite an ignorant assumption to apply to different games. Every game has their own balance issues, and even if some of the general complaints may be similar, they all have different reasons for being complained about. And none of the arguments work across different games; gameplay balance complaints for World of Warcraft aren't going to be comparable to balance complaints for any other game other than WoW.
Diversity complaints are no different here; they are case specific to the shows being talked about. Even if the complaints seem to repeat the same rhetoric. As I said, you used an example of Ghostbusters, but honestly the diversity complaints in that movie are not about race at all, considering we're looking at the same ethnicities that were portrayed in the original Ghostbusters. And overall, none of its criticisms can be compared to that of Rings of Power or Witcher. It's really naive to assume that just because you're hearing the same repeated rhetoric that the arguments must be the same.
And there's also the fact that diversity arguments will never be black-and-white. It's always going to be subjective. It's a matter of taste. We're talking about modern adaptations that are taking creative liberties to modernize ethnic representations where they were not originally (or fictionally) meant to be represented as being multicultural. There will always be a point of contention when race swapping or gender swapping in an adaptation. And the arguments are not all the same even if it comes from the same crowd. And I get that there will be some people who WILL be making the same arguments across the board, but let's not pretend that all complaints over diversity are one and the same and that somehow these issues are unified whatsoever. Just as with my example above with gameplay balance, everyone will have their own idea of what 'Balance' means, and would be complaining about or asking parity for their own ideal concept of how the game should play. No different here when subjectively talking about TV shows that adapt existing source material.
Cuz let's face it, we could be talking about a movie like the more recent Magnificent Seven which diversified the ethnicity of all the main characters. Is this a good or bad thing? Is this right or wrong? Absurd or acceptable? It's up to individuals to decide what their preferences are, and there's no blanket argument for or against this type of adaptation. There is no right and wrong when it comes to subjective preferences, even if some people choose to associate certain points of view as being 'racist' or 'woke'.
I'm making an argument based on principle here. Even if I don't agree with people who complain a game as being imbalanced when I think the balance is fine, I wouldn't discredit their opinions on the basis of them complaining 'the same problems as on every other competitive gaming forum'. People are entitled to their own opinions.