The point they're making is that someone who is "staff" at a random company might not get hired as "staff" at Google. Anecdotally, I know people who have been "

The point they're making is that someone who is "staff" at a random company might not get hired as "staff" at Google. Anecdotally, I know people who have been "principal" or similar at other places and come to Google as L4 or 5 with a raise and interesting work.