It's completely justified. For example: show me where in Poltz's long career as a writer and editor that he secretly squeezed in the years of UX, design, and development experience that qualifies him to make a statement about designing user interfaces.
The problem is that editors simply don't believe there is special expertise here or that it requires anything beyond their insight.
I admit that I'm not always happy with the result ... http://spectrum.ieee.org/aerospace/astrophysics/the-cosmolog...
This design doesn't incorporate many of the base standards for displaying long-form web content. Font size is way too small (should be 16-18px, 14px absolute minimum), column is too wide ("ideal" is 66 characters, though there's a wide range). A good starter article: http://informationarchitects.net/blog/100e2r/ There are many, many more.
Until that page is completely redesigned and returned to a readable baseline, it's difficult to discuss or test anything.