You can get your own evidence for his claim, starting points to look: previous banking crisises, why the latest banking crisis happened, how banks buy bonds/treasuries, how they are valued in relation to interest rates, how the fed controls interest rates & therefore bond valuations & therefore bank collateral, what a bank deposit from a customer really means for a bank, what fractional reserve is, how the COVID rules meant bank reserves had no minimum, why banking cannot possibly be solvent at a single point in time, what money is backed by, what happens if a bank breaks the rules, who decides if they break the rules & what incentive does that regulator have to actually crack down on crime (because their employees have higher aspiratations), how many US banks are consistency & constantly fined for fraud, how banks relied on fed interest rate guidance & how that relates to their duration mismatch of depsosits/investments