How exactly do you reduce that number when it’s a fixed quantity at FAANG, big tech with their stack ranking, managing out and OKR’s that requires to put a cert

How exactly do you reduce that number when it’s a fixed quantity at FAANG, big tech with their stack ranking, managing out and OKR’s that requires to put a certain number of people as “under performs”? The entire system makes absolutely no sense, precisely when looking at the numbers. You could do anything you wanted during the interview and that still won’t change the outcome that the same number of people will still be fired at the end of the day.