There are many different types of blogs on WordPress spanning dozens of different languages. Moreover, WordPress classifies the blogs into two primary categories (Popular and Spam). While those belonging to the popular category are acceptable to WordPress, the ones classified as spams are obviously not. Furthermore, the unacceptable ones being "spam blogs" or splogs, they are meant be deleted as soon as WordPress finds them or they get reported.
The intriguing point however is that "SEO" blogs to have been considered as "spam blogs" by WordPress and hence they have no place in WordPress observes Lee Odden. Before you reach any conclusions you need to have a decko at their definition of SEO blogs from WordPress, "SEO blogs: Blogs that are written for search engines instead of humans. These blogs are dedicated to trying to fool Google and other search engines into ranking them highly. WordPress.com is not meant for this type of activity."
Certainly not and such blogs shouldn't have a place anywhere. Given the fact that WordPress is referring to the blogs which try to hoodwink search engines as spammy, the fact that when they term the spammy blogs as SEO blogs it leads to a mis-perception that the blogs which simply talk about SEO are also included. Perhaps such "black hat" blogs could be better termed as "search engine spam blogs" as Lee suggests, or any other term which clearly draws the distinction. Apparently there are quite a few blogs on WordPress which are about SEO