“Cultural apropration” is a nothing burger championed by people who often have no ties to the culture that they claim needs their protecting. A white man speaking for indigenous american culture does not give indigenous americans more of a voice, it takes their voice away by revoking their ability to speak for themselves.
You are grouping all indigenous people together by saying “denying the existence of issues they care about and talking over them” I emplore you, who is “they”? Are you implying that all native Americans hold the same beliefs? That they are the same people? I also never claimed to represent native Americans. I would never speak for a culture or peoples I don’t belong to.