I think that a very important distinction is being made; one that is too often ignored, as the author notes. Unfortunately, in doing so, the author falls into the DE/ID devide which claims many products prey: "My job is to design a working product and send that to an industrial designer to dress it up. "
A truly well designed product must be created through highly collaborative efforts between designers and engineers. This sequential mode of "engineering" a product then "throwing it over the wall" to designers to dress it up can produce a product with poor ergonomics, gemeric form, and unappealing style. (The opposite case is also detrimantal, as the author indicates.)
Any product must be treated as an integrated object with both functionality and style: highly interdependent and equally important elements.