The author is focused with technical review, and as such he probably fails to see just how important personal review is. Yes, you are being reviewed technically, but you are also being reviewed personally. You may know a lot of technical things, but do I want you on my team? The phone interview is what i'm going to use to make that decision. Technical we can work over later, but only if you sound like someone I want on my team.
I'm always willing to say, "They look like a great fit for the team and our goals, and let's give them a chance to learn the tech" versus, "They know a lot of technical stuff and let's give them a chance to see if they can learn to work with other people."