Okay, I read it. It is mostly packed with false equivalences. The Maya, Inca, and Aztecs, practiced religious human sacrifice on a mass scale killing millions over centuries. They practiced flaying victims (skinning them alive), ripping out their beating heats, cannibalism, and a whole range of related practices.
The archaeological record does not much of that, particularly your false statement of "millions" of victims. Those "facts" come straight from the Spaniards who conquered them, using that alleged behavior as justification for subjugating them. By "false equivalencies," of course you mean that Asian and white people did nothing of the sort. Well, except for that whole burning of "witches," the tortures and executions of at least 32,000 (per History.com) humans during the Spanish Inquisition, the experiments, tortures, rapes, and other horrific practices during the Holocaust, and so on.
Sure, the Nazis, like many other dictatorships usually on the Left and often Communist, practiced mass slaughter on the basis of racism, etc. They didn't do it ritualistically nor did they practice cannibalism.
So you think the Nazis were Leftists? Hahahahaha!
Newly-Released Documents Describe 'Rampant' Cannibalism at Nazi Concentration Camps
Dismissed.

