Those numbers are dependent on retention of the social market economy.
And the Bundesbank is far more influential on both the economy and the government than people unfamiliar with that system may realize. This extends to the eurozone too, what with the heavy influence on the European Central Bank, which is its clone.
One has to make some assumptions about such things.
If society breaks down in the next 10 years, yeah, all bets are off.
This is not so much a matter of the Federal Bank exerting influence as it is math. The fact that it is the Federal Bank that does the math does not change the underlying facts.