I'm sure they get a lot of false negatives, which is arguably better than false positives as long as you can fill all positions.
I'm interested in seeing whether the same mix of staff and company structure can prosper in a recession.
What's fundamental is that it is those few abnormal people who change the world 1000x more than the regular person. When you have near infinite money like Google, I'd be very afraid of missing out on those few people who are going to carry the company.