Suppose you do an experiment with three groups of people: one that is used to taking pictures with their smartphones, one that already worked with a DSLR one and lastly a bunch of professional photographers. Now give all of them the same high-end DSLR+quality lense and send them out to take pictures. Your claim seems to be all three groups would take equally good pictures. My claim: no way. Experienced photographers for instance just know things about lighting etc that take years to learn and won't be in your textbook.

The professional photographer doesn't change anything about the purely technical aspects of the image, though (which is defined only by the sensor and lens). This isn't about magically improving crappy photos but rather improving photos taken with a crappy lens (an obvious application would be cameras in phones).

That a good photographer is able to deliver a far better photo despite the constraints of his tools goes without saying, but it's not what this is about.

No. My claim is that this (very interesting) article is about improving quality from low quality lenses, and quality of photographer has nothing to do with this problem. Given a low quality lens, a professional photographer is still going to come out with a fuzzy image.