This test wasn't the only metric they used, it was just the initial filter. A good developer needs to be able to come up with creative solutions, but also to just get down in the dirt and analytically solve a problem. Someone that is good at both makes the best developer.
Also, you apply your cheapest/most scalable filter when your volume is the highest. If you're worried about false negatives, you open it up a little wider and deal with the false positives at a later stage.
Also, you apply your cheapest/most scalable filter when your volume is the highest. If you're worried about false negatives, you open it up a little wider and deal with the false positives at a later stage.