I love the article, but think the argument gets tied up in semantics here.
I’m not a code-savvy designer, but (more and more) many coders certainly do design.
Development used to alienate many design-minded professionals due to a treacherously shallow learning curve and the utilitarian instinct fostered in such an environment.
As programming languages mature and markets expanded (inviting increasingly diverse talent), upstart programmer’s ambitions have grown.
Graphic design frameworks like; hierarchy, typography, grid, and rhythm are pollinating across disciplines — sowing seeds within the vocabulary of development.
Designer and developer are not mutually exclusive. Different designers utilize different media.