This is far from the first time, so let me state this more explicitly: John Horgan is a provocateur with no knowledge of any field, whose only claim to fame is that he is so breathtakingly and publicly wrong that he gets people with real expertise to engage with him. Then he disingenuously frames the result as a real intellectual controversy with him at its center.
He is one of the top reasons I don’t take anything from Scientific American seriously anymore, and a great example of how the incentive structures in science popularization ruin it. I find that I can tell how savvy an online community is by how much it likes his work.