The problem with this article is that is glosses over one major problem: if Germany's currency moved in accordance with its economy rather than the entire European Union then its exports would be grossly overpriced and uncompetitive. It's the formation of the EU and a single currency that has allowed it to remain an exporting country rather. The article can not compare apples to oranges and make sense.
But you could make the same argument against any US state that remains cost competitive due to the currency. And it also discounts the fact that Germany did very well during the period when it did have it's own currency. As it is, German economic performance does have an effect on the Euro, being the largest member state.
True, but, there is a policial union of states in the US that doesn't exist in the EU. The EU is a monetary union without a political union, this means that it's politically unpalatable to explicitly redistribute tax money from the relatively rich to poor regions (Germany/France to Greece/Portugal) in the same way as Washington or London might to W.Virginia or Newcastle.