I think the asset figure did not include unrealized losses on bonds that they intended to hold to maturity as banks are not required to deduct those from their total assets. As deposits flowed out of the bank, they sold some assets and realized those losses.
> As of December 31, 2022, Silicon Valley Bank had approximately $209.0 billion in total assets and about $175.4 billion in total deposits
I have a hard time believing they lost 20% of their assets in the last 70 days. The shortfall, if any, should be minor.