No, they are not. This is a common misconception. Most people realize how they can't simply put in every genderidentity, which was why the original suggestion (seems) to imply that they ask to be able to just set their own customed pronouns rather than having to list all the ones, or just for a neutral option. I have never seriously seen anyone asking for all gender identities to be available in a choice menu with dialogue specifically written for it, this is simply a fear a lot of people have for what "will happen" if we even travel slightly from status quo, an understandable fear but still not really fully justified in reality.