(That whole piece is based on assimilating the euro to the Bretton Woods dollar, which is, to say the least, a whopping strawman).
Confused much?
What they're saying is that the Euro is doomed because it is the main currency, which doesn't compute. When the capital development of a country becomes a by-product of the activities of a casino, the job is likely to be ill-done. — John M. Keynes