A lot of these noble savage narratives emerge from Latin American studies (history, archaeology, literature, etc.), particularly among Mexican and American-educated academics. There is truth to the idea that the complexity of indigenous systems is unappreciated by the general public, but there’s always this underlying fetishization of a pseudo-magical indigenous “way of knowing” contrasted with the (historically far-better performing) European scientific method. Indigenous cultures are redeemed from European military conquests by insisting that the European way of knowing is myopic and selfish (being focused on profit over sustainability, the individual over the community, etc.) in contrast to the indigenous way of knowing, which is holistic and communitarian.
The author does have publications related to these irrigation systems, though, so maybe she has a valid point to make and the article just didn’t land for me.