He's making it sound like depositors are going to get 80% of their money back tomorrow. It's going to be a years-long legal battle while affected companies are going to potentially shutter due to an inability to meet obligations. Also, his number of 80-85 is based on the yield of the treasuries, but old treasuries like this are hard to move.
Why won't the FDIC resolve this quickly for depositors?
For customers who are startups, investors, and large tech concerns, FDIC insurance of $250k may not cover the balance. Sure don't want the $2M you have left from your last funding round to evaporate, or even be frozen.