Indigenous people are modern participants in the world. They're part of the same global economy and global culture as everyone else. There are no "uncontacted tribes", everyone has been in touch with their neighbors the whole time, for as long as there have been humans. Every part of the world, except Antarctica and a very small number of islands, has been inhabited by humans a very long time, with Polynesia being one of the last places humans arrived at a few thousand years ago. Humans have been in NA for at least 30,000 years, Australia for at least 40k but probably longer, in Europe and Asia for at least 50k. Even the famous North Sentinelese have had more and less contact with their neighbors over prior centuries. Their current closed borders are a modern policy decision made by a modern people choosing how to interact with other people in the modern world. "Indigenous" is defined largely in contrast with colonizers and imperialists. It is not an ideology or philosophy. It is not a belief system. The only thing that is consistent across the whole group of indigenous people is their conflict with colonizing and imperializing societies. Beyond that they do not necessarily share any beliefs, ideals, or values as each indigenous culture has it's own cultural values and beliefs, and individual members of indigenous societies in turn have their own beliefs.
Anprims, on the other hand, are dorks who are wrong about everything. It's a silly ideology of idealistic utopians who think, for whatever reason, that if their un-educated beliefs about "primitive" life were the norm something would be better. We often deride them on the grounds that their ideal society requires human population to be reduced by 90 or 95%, that it wouldn't even work, and that their view of history and the entire notion of "primitivism" is ahistorical and unscientific racist tosh.
The guy who came up with "Anarcho-Pritimivism" is an 80 year old white guy with a degree from Stanford who used to be unironic buddies with Uncle Ted until Uncle Ted denounced him as a loser. You don't have to take people like that seriously. Frankly even referring to it as "anarchism" is a serious discredit to Anarchists and Anarchist Philosophy and it shouldn't be accorded membership. AnPrims are among many "post left movements" that aren't really movements, barely have any adherents or organization, and whose numbers are tiny.