Having grown up in that area of the Midwest, I largely agree with the author's categorization, except that "people on their way to somewhere better who got tired and decided this was good enough" describes a LOT of the midwest, not just Indiana. Significant chunks of Michigan, Ohio, and Missouri, most of Iowa/Kansas/Nebraska, etc.
If you read the history of westward expansion, "got tired and decided this was good enough" is literally true for how much of the area got initially settled (by white people)
I thought the Indiana aside was odd as an objective assessment, but it worked well as a flavorful bit of travel writing to help me understand the perspective of the visitor to Greenland.
Vs. say some parts Cleveland, where I've been robbed at gunpoint the second my vehicle broke down and people noticed I'm not from around there.