As proof that these villagers are smarter than IQ tests would suggest, Steven offers a survey showing that most of them can correctly identify which plants are food, firewood, etc. This is described as "extensive ethnobotanical knowledge".https://twitter.com/spiantado/status/1275783966289608704 …
Straussian interpretation - putting that story in the introduction is a wink that he doesn't real mean any of it and indeed his arguments are laughably weak if you don't want to be fooled.