I think it's just a different beast. He writes:
It’s perhaps not the greatest at finding what you already knew was there. Instead it is designed to help you find some things you didn’t even know you were looking for.
If you are looking for facts you can trust, this is almost certainly the wrong tool. If you are looking for serendipity, you’re on the right track. When was the last time you just stumbled onto something interesting, by the way?