Um, yes. There is no capital stock. If it were otherwise, the federal budget would no longer have to annually contribute 110 billion EUR to pensions by now.
Every euro that comes in through pension contributions from my side goes directly back out again, plus 110 billion euros from eco tax, mineral oil tax, value-added tax, etc.
That makes a redistribution sum of about 450 billion euros per year. If no one pays contributions anymore, the whole thing is immediately over. Nothing is saved up.
I think we understand different things by “capital stock.”
From an economic point of view, a capital stock is not an account or a piggy bank in which saved money lies, but it consists of the real assets that generate the returns that can be distributed at all. A pile of money generates nothing.
Such a capital stock is also what yields returns for funded insurance schemes. They don’t open money storages either but invest.
In addition, pension insurance funds are used to finance benefits not related to insurance, the amount of which exceeds the tax subsidies (!!!) (at least as far as I last checked about 5 years ago).
In summary: capital is not the same as money. Well, an unusual wording in a house building forum, admittedly.