It all comes back to fractional reserve banking. It is the root of all evil in our financial system. If Rothbard could only see the current state of affairs...
This is a crank opinion that is somehow everywhere. The building is real, it's not fractional.
You do not even need fractional banking for this. Same thing could happen without it. Someone lends money and is unable to pay it back. Both sides pretend that things will eventually go well. As at least on paper they have not lost anything until prices are realised.
Rothbard would probably lament that we have not yet turned children into "financial products" as well.
https://mises.org/mises-daily/children-and-rights