The original Article was outdated, antiquated, obliterated..
What worked back when this article back in 2010 was originally written would NOT work today. The big search engines have all but settled in, and making more and more demands. Some so ridiculous, I've often wondered if they are drinking on the job.. To me, SEO is simply organizing your company or business's information so that the search engines can serve it up proper to their viewers.
When this article was written, PageRank was still a thing, and it mattered. SEO also now includes social media which has blown up, every which way! Get your viewers to share and help promote your brand or products.