There are many layers of stupid to account for in this particular blog post. First, buying text links is not considered a search engine optimization (SEO) best practice. Google and Matt Cutts tend to frown on it. Consequently, selling text links is a worst practice, too. Pairing either tactic with free advertisement monies granted by LinkedIn is just plain dim-witted in a most doltish sort of way.
And finally, if you think you can improve your websites rankings in Google by purchasing text links from casino gambling sites, then you just might not understand that SEO still can’t fix stupid.