((I have degrees in Economics... Trust me, I already accounted for these things.))
HRH Prince August Wilhelm clearly lacks an education economics. As the negative affects would be minor, but the positive effects huge. As the current economy has shifted back towards a peace time stance. Furthermore, the expenditures on consumer and industrial goods make up the vast majority of the economy. Furthermore, I find it odd that he mentions cars which are a good very few Germans can afford. True some factories were retooled, but many have returned to the production of normal goods, hence the argument is invalid. A war economy is also not needed for some far off war that is primarily the concern of our allies. The incipient price rise would be minor, but given our economies export focus, more competitiveness would expand our economy buoying all.
On the Reichsbank/Bundesbank, sure but the new structure is far better at removing the influence of those that should not hold it. The name does not matter but its governance does.
Furthermore, the reduction in consumer goods subsidies reflects less need for price supports and a reduction in military expenditures for items not covered under the military section of the budget, ie. uniforms, tents, and other such items.