All I'm saying is that it's a way of thinking about it. It clearly helped the author think about "rasterized 2D screen-space triangles" rather than "something s

All I'm saying is that it's a way of thinking about it. It clearly helped the author think about "rasterized 2D screen-space triangles" rather than "something something 3D". They clearly had some misconception and "WebGL is a 2D API" helped clear it up. I'm not saying it's the one true way to think about 3D graphics APIs, or that it's wrong or right.