It looks targeted toward Link Farms
SE are cracking down on Link Farms. But they still must give props for relevant links because it's the best way to justify a tool like Page Rank. As the article states, a common oversight is listing on pages with language about "purchasing or buying links."
I cannot really understand why he suggests the extra coding to break the significance of the link. The only thing I can offer as an explanation is the phrase that he uses to preface the suggestion:
"What if a site wants to buy links purely for visitor click traffic, to build buzz, or to support another site? In that situation, I would use the rel=”nofollow” attribute."
If a site is buying the link PURELY for those reasons alone, I guess I might agree. Otherwise, stay away from sites that contain language about "buying or purchasing links." Afterall, the author mentions websites removing this type of language as proof that this is an indicator for the SE. They cannot remove the significance of links...OR the significance of the Search Engines' very own paid link programs. Language of the link page is key at this point.
Just my two cents though