"Google contains more than 100 algorithms that make it the world's most popular search engine."
Whoops. I think he's trying to say that Google has 1 algorithm with hundreds of everchanging components.
Someone who suggests that writing articles is the number 1 SEO technique should be a little more careful with the SEO articles that they write.
The author also makes the assumption that all the search engines are using latent symantic indexing. People more knowledgeable than me have stated that isn't happening.