Turns out he's wrong. (Stunned, I know.) They were under supervision for over a year. I'm sure he'll post a retraction:
https://www.nytimes.com/2023/03/19/business/economy/fed-silicon-valley-bank.html
WASHINGTON — Silicon Valley Bank’s risky practices were on the Federal Reserve’s radar for more than a year — an awareness that proved insufficient to stop the bank’s demise.
The Fed repeatedly warned the bank that it had problems, according to a person familiar with the matter.
In 2021, a Fed review of the growing bank found serious weaknesses in how it was handling key risks. Supervisors at the Federal Reserve Bank of San Francisco, which oversaw Silicon Valley Bank, issued six citations. Those warnings, known as “matters requiring attention” and “matters requiring immediate attention,” flagged that the firm was doing a bad job of ensuring that it would have enough easy-to-tap cash on hand in the event of trouble.
But the bank did not fix its vulnerabilities. By July 2022, Silicon Valley Bank was in a full supervisory review — getting a more careful look — and was ultimately rated deficient for governance and controls. It was placed under a set of restrictions that prevented it from growing through acquisitions. Last autumn, staff members from the San Francisco Fed met with senior leaders at the firm to talk about their ability to gain access to enough cash in a crisis and possible exposure to losses as interest rates rose.