I'm gonna tell you a secret, OK? Indigenous people can, believe it or not, post L's sometimes... Yeah, I know it's hard to believe, but Indigenous groups have complex internal politics and are fully capable of having bad ideas, seeing as they are, you know, human beings and all.
True, some natives (even in the US) think they are superior than the mestizo population because their blood is much more pure than those of mestizo/pardo population, but this idea is not popular at all with most native politicians (This is similar to how the black movement in Brazil started as a far-right monarchist movement that eventually became left-wing).
but my impression just from briefly looking at ethnocacerism is that it seems really the same as any other far-right movement: an attempt to push people away from a coherent ideology that would actually liberate them. I wouldn't be surprised if this movement is essentially funded by capitalists, Peruvian or Septic or whatever else, as a bulwark against class consciousness among Indigenous Peruvians.
They are not far-right, they openly said they are anti-imperialist, anti-fascist and anti-marxist (mostly due to them being former soldiers that fought the Shining Path, they follow José Carlos Mariátegui instead of Marx). They started out as a group inspired by Left-Wing Socdem Military Dictator of Peru Jose Velasco, who promoted Native Culture and Language, and also hated Chile because of the War of the Pacific. These soldiers became much more radical during the 1990's because of Fujimori promoting a genocide in Peru. Since they are also veterans of the wars against Ecuador, they also hates them, but they also want to united with Bolivia and really like Evo Morales, Hugo Chavez and Lula da Silva (all of whom are minorities). They are currently agains the Peruvian goverment and are allied with the Shining Path, Communist Party and the Socdem and Liberal parties. No one seems to know why they use nazi symbols, but I guess it's because the leaders were very inspired by WW2 and were trained in WW2 era tactics to use against the Shining Path during the 1980's. They seemed to have let go of some of their racist views, even going as far as to defend some Venezuelan immigrants in Peru, saying that they also are Pro-Bolivar.
I think the magic word is "cosmic race" and the guy who invented this idea was José Vasconcelos. I don't know how relevant this idea is for ethnocacerism, but it is something to be aware of, although I could be getting the idea a bit wrong, I am by no means an expert.
Ethnocacerism is against the comic race idea. In resume, José Vasconcelos saw race segregation in the US and white supremacy and was like "Wait! They are all wrong and dumb! We shouldn't separate race, but rather unify all races into a single powerful race!". Nowadays we know that race doesn't exist, but at that time it was a progressive idea. And it inspired the goverments in Latin America to promote interracial marriage and relations (Which to many Afro-Latinos and Natives, was the only way the could buy land until the 1930's. But for sometime the media at the time portrayed them in positive way, even some Far-Right groups in Latin America promoted race unity), because they would ended up all becoming a powerful race that would unify the world in peace. Ethnocacerists are against this because they used to think that Incans (Central Andean Natives) were better than anyone else, specially Amazon Natives and Afro-Peruvians. But it seems that they have let go of this ideas.
Peru had a left-wing Socdem Military Dictator called Juan Velasco, he promoted Native Culture and Language, he also hated Chile because of the Chilean War against Peru and Bolivia during the 1800's. He was Reverse Pinochet, while Pinochet would steal land from natives and privitaze stuff, Velasco would give land and nationalize. Eventually the US had enough of Velasco and in the 1970's the Right-Wing of the Peruvian army removed him from power. But his ideas had an impact on the Peruvian Armed Forces. During the 1980's Shining Path insurgency and the War against Ecuador, some Military Leaders attempted to get the goverment to regain the trust from the Native Population, this is what eventually lead to the Ethnocacerist movement. Then after Fujimori's coup and during his dictatorship, he was killing natives, eventually he became so unpopular that he had to flee to Japan, in Peru some military leaders attempted to remove him with a coup.
The Fujimori Dictatorship had another impact on leftist in Peru, many turned radicial, and since he targeted natives, many Incans became enraged at the Mestizo majority and the White minority who supported Fujimori. The 2000's had some instability thanks to Fujimori fucking up the economy, the neoliberal, socdem goverments had some trouble governing, and the fear of Keiko Fujimori return to the presidency basically created this weird trend that if a candidate went on run-off against Keiko, everyone should vote for the Anti-Fujimori candidate regardless of their ideology, because anti-fujimorism is that strong.