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 s

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.