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Perhaps I shouldn't speak for Scott Sumner, but I feel pretty sure he wouldn't recognize your opinion of what he supposedly thinks.

If you make your comment at econlib, he's not unlikely to respond.

My comment is a critique of the content of his article, not an "opinion of what he supposedly thinks" in need of his recognition.

If "thinking that" are trigger words now, replace it with "acting as if" to same effect.

Your comment is a critique of a lot of content you read into his article without the formality of it actually being there.