Thank you, Leilehua.
Shasta, I actually agree with you completely that it's a priority to preserve, and continue to use, the terms each culture has, in their own languages. However if a multi-Nation Native group also adopts a modern term as a way of uniting across tribal lines, it's not my call as to whether they get to do that.
I certainly hope people's adoption of pan-NDN terms for those purposes doesn't lead to the erasure or forgetting of the traditional terminology and concepts, but aside from continuing to speak up about language and cultural preservation, I'm not going to tell a Native group how to self-identify.
Harry Hay is definitely to blame for a great deal of misappropriation and misrepresentation of Native religions and cultures. If he, or someone like him, originated the term, I agree with you that needs to be uncovered, discussed and acted upon. I haven't seen evidence that he originated it, but I haven't read every work by or about him. I did find that he made claims that I found dubious, so even if he claimed to have originated it, I'd want to see proof that he didn't just steal that, too.
Peace.