Earlier quoted context omitted.
You seem to have ignored the parts about agricultural and construction inputs. Additionally, the manufacturing output of the US economy has continued to grow in the 'post-peak' period.
No, I read the whole thing. It talks about imports and exports of raw material, but excludes the import of those same materials in the form of goods manufactured elsewhere. For example, raw copper would be included, but copper coils in a refrigerator manufactured in Korea would not. That seems like an extremely arbitrary distinction, and one which would likely change the graphs presented significantly.
I have to agree with you. The article is fatally flawed unless it can address these issues you mention. I'm surprised the readers here didn't catch it but I suppose they were busy discussing how quantities are priced at the supermarket.