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He’s correct.

I doubt it. He rather simplistically assumed correlation implied causation, and his conclusion is quite debatable. I remember an interesting study that showed that people ~100 years ago, who got very little exercise by modern standards (there were certain professions where people got very little movement over a 12+ hour workday, so they made ideal subjects for study), were still quite thin, even when they had access to relatively inexpensive food. The conclusion was that rather than "laziness causes obesity", it appeared to be the other way around: obesity causes laziness (presumably by decreasing energy levels, increasing recovery time, causing chronic inflammation, etc.).

Personally, I think that this simplistic article is worthless.