Author here. I replied to a similar comment, but I'll reply to this one too because it's a really good point, and I think I should have done a better job of calling out in the post that humans suck at hiring as well.

Most recruiters are terrible, and they're kinda set up to fail because the data isn't there in exactly the same way. The difference is that good human recruiters can make some meaningful warm intros, let 2 engineers get in a room together to see if there's chemistry, and get the hell out of the way.