That’s not the point - it’s been at least a decade since “web designer” means doing graphic/interaction design, and not coding in HTML and CSS.
What they are saying is that, in the same way a car designer cannot do a great job without having decent knowledge of aerodynamics and the physics involved, good design for the web requires some understanding of the underlying technologies.
What they are saying is that, in the same way a car designer cannot do a great job without having decent knowledge of aerodynamics and the physics involved, good design for the web requires some understanding of the underlying technologies.