Yeah, that info stills holds water. Looks like they dressed it up a bit since i read it. (2 years ago)
It is useful and reliable too. You can run a free test to know the ranking statics with most SEs and sites like Google....
Yeah, I'd say that's still very accurate. Actually that's one of the most thorough articles on SEO you'll find for free.
Its average and an ok starter guide, funny thing is though i have never even heard of half these "SEO Leaders".