>* Big trade partners within the EU are typically pairs dictated by geographic proximity (for instance the Netherlands and Germany, Germany and Poland and so on) or by the possession of some vast natural resource (eg. Germany - Russia in the case of natural gas).*
I'm not sure what you mean by big trade being between "pairs dictated by geographic proximity".
For example, Germany is the largest exporter to lots of countries in the EU, including Greece. I don't think we trade much with any of our "geographic neighbours". And Italy and France do quite well in exporting inside EU too.
Most importantly, I don't think he means this kind of industrial, agricultural trade, in his post. It's mostly about entrepreneurs in the tech field and new style businesses.
It should be also obvious that he knows what he's talking about (the original article that the post criticizes), because, unlike the critic, he has already created and worked with several companies in Europe.