This is not what I gathered from the documentary "Four Horsemen". Seems like actual banks are printing money out of thin air?
Banks no longer need reserves with the Fed but they are still subject to capital adequacy regulations.
Banks that don’t have assets to cover all their liabilities (deposits) are insolvent. Non-delinquent loans are assets to the bank (liabilities to the customers) that are created when banks lend and create money (which become deposits - which are liabilities to the bank and assets to customers).
Only the central bank can originate money without creating debt.