I'd encourage you to re-read what I wrote, because I've very intentionally avoided telling anyone what they can call themselves.

Part of this whole respecting preferences is that individual terms have to be treated separately. "Indian" is different than "American Indian" which is again different from "Indian country" or "Indian law". Someone may dislike some or most of these without necessarily disliking the others. The ones with specific technical meanings we're unfortunately stuck with in context.

Another popular example of this sort of issue is "Navajo" itself, as many would prefer to be called Diné or some derivative thereof.