It's an interesting argument, but I don't think it's necessarily...

It's an interesting argument, but I don't think it's necessarily true. German exporters may choose to hold foreign currency assets rather than repatriating their earnings, therefore lowering demand on their national currency. China does this.

Also, it's a bit silly to claim Germany doesn't have a consumer economy, as if they are a third world sweatshop.

The problem with the Eurozone re central banking is that it penalized net importers who naturally measured a trade deficit. Eurozone rules prohibited deficit spending and prevented fiscal transfers, so the only path for those countries was "borrowing" from the ECB, as "austerity" measures cause demand to shrink and bring about recession (the opposite of a country trying to rapidly develop in order to produce an exportable surplus). The constitution of the Eurozone was such that every member state ought to have been a net exporter. But that isn't possible, especially when different countries are at different stages of historical development. This is what caused the debt crises.