Yea seems like the more interesting title/angle for the article would be "Tesla misses model3 production by 5-6x", rather than "Tesla fires 1% of workforce".
I'm not a fan of firing the bottom 10% of annual 360 reviews, but, do you think that having a 10% false-positive rate on interviewing/hiring is outside the realm of possibility?
EDIT: Just so you know ... the cumulative quarter average (done annually) cull of the bottom 10% (people who have been put on improvement plans 3 quarters ago), is done by people that have nothing to do with interviewing/hiring. You'd probably be firing the wrong folks.