I stopped reading as soon as the reviewer wrote "There's something uncomfortable about Pachacuti converting people to Catholicism".
This is someone who clearly doesn't understand Civilization or Christianity, and clearly has hostility towards the later.
It’s probably just a reference to the Catholic church’s role in the forced conversion and murder of the Incan emperor (Pachacuti’s great grandson), and the bloody conquest of their territory and eradication of their culture that ensued.