I guess I'm sympathetic to its goals but found most of it frustrating:
What does indigenous sovereignty look like when police and prisons and borders (the usual tools of sovereignty) are abolished? The authors allude to a specifically indigenous borderless non-coercive form of sovereignty but don't bother describing how it should be adapted to modernity.
In a country where 2.9% of the population is indigenous, what exactly does 'indigenous leadership' look like? It's unclear whether the authors are calling for full-on rule by a tiny minority or some softer form of leadership where non-indigenous leaders take policy cues from indigenous people. There's also little clarity about how much of the program is directed at the US vs. the entire world.
The authors portray indigenous societies as uniformly non-patriarchal, non-homophobic, sustainable, etc. (i.e. in line with every value professed by a 2022 leftist). I'm on board with the idea that they were/are broadly better in many of these areas than colonizer societies, but failing to acknowledge any diversity or internal contradictions raises my Marxist alarm bells. This also kind of exists in tension with their call for a 'world in which many worlds are possible'.
Sometimes it seems like a moral equivalence between different forms of oppression is conflated with strategic equivalence. (C.f. Matthew Huber's for a good discussion of this tendency).

The idea that in 2024 and with 7 billion people on the planet we're supposed to be able to transition to a "borderless non-coercive form of indigenous sovereignty" with minimal hierarchy is hilarious and shows how cognitively dissonant the resist libs or soc dems are. The only way they see us overcoming our problems is through pure fantasy.