Surprising? When you're unemployed during a major economic downturn lots of people would be willing to leave one of the most expensive cities in the country.
There's an obvious and boring explanation for the prevalence of "willing to move" on this list, and that is if the layoffs mostly hit recent and more junior hires. Another company I worked for had a significantly younger and more mobile workforce, and it wasn't uncommon for new hires to move to the bay area from across the country, and then relocate to another regional office or even overseas just as easily.