This type of epistemology is that of a naive realist and is much more wrong than the Platonist the author tries to ostensibly criticize. Naive realism is outdated by almost 240 years.
Indirect realism or correlationism. The first would mean being aware of mental representations instead of physical objects, and the second is Kantian where the mind structures the noisy flux of sensations according to categories of thought like space and time. The second also means that the way we experience the world depends on the kind of creatures we are, and not the way the world is.
The map is actually about necessarily true properties that the territory is built on. That in any experience the features of the map exists in the territory.
The author argues instead not to be confused with the map because of potential deviation from the reality of the territory. But the map is about the categorical truths of reality which the territory is conforming to.
It’s what guarantees mathematics’ “unreasonable effectiveness”. Mathematical or scientific maps are discussing necessary properties of all human experience—-a type of knowledge called the a priori synthetic.