Does the author not understand the concept of "opinion piece"? Every "article" he takes issue with is NOT a scientific article, but an opinion piece.
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I think there's an argument to be made that Scientific American shouldn't have opinion pieces that readers will misinterpret as scientific fact.
I would guess that if you asked 100 random people who had heard of Scientific American, many/most would say that SA publishes science and has no Opinion section. Before this dustup, I would have been in that camp.