This obviously isn't an accurate article. The writer occasionally writes for ExiledOnline, a formerly expatriate paper in Moscow. Exiled is in the Hunter S Thompson tradition of gonzo journalism. They are more interested in conveying the truth than being factual.
Facts can obscure the truth, or if the right facts are chosen a completely false story can be told. The author is trying to convey the state of Mexican political economy, not compile a list of facts about Mexican political economy. That some details may be stretched or erroneous is inconsequential so long as the thesis remains strong. Nitpicking over who killed who and why is entirely beside the point.