This article is definitely written for someone who is already aware of what Strong Towns is going for. But I think that you may be missing the point of the art

This article is definitely written for someone who is already aware of what Strong Towns is going for. But I think that you may be missing the point of the article, which is simply criticizing the heading of the first graph: "Net Civilian Public Investment, percent of GDP". The article is merely claiming that that metric isn't valid, while assuming that you, as a reader of Strong Towns, already believe that too much is being spent on the creation of new infrastructure. Justifying that point is basically the entire purpose of the rest of the website.