From reading the article I get the impression that the author isn't that familiar with the scientific literature at all. The evidence he presents against the usefulness of cardio for weight loss compares a group of weightlifters against a group of runners who ran only 20km per week and they still lost marginally more weight than the weightlifters! Cardio really should be a minimum of an hour per day, at least 5 days…
There are many studies detailing the inefficacy of cardio for weight loss for various reasons -- from Friedenreich (2010) which actually compares cardio vs. non-cardio groups... to Willbond et. al (2010) which talks about the overestimation of caloric expenditure.
Not to mention the meta-analysis from last year: http://www.ncbi.nlm.nih.gov/pubmed/21787904
But I guess you prefer observational, correlational studies instead. Of course people who run marathons are likely more fit. Derp.
Guess what, those who drink diet sodas are more likely to be overweight. I guess diet sodas make you fat?