[lordlicorice]

He's not suggesting that you subpixel antialias manually. He's pointing out a benefit of leaving your images as vectors: the browser knows the subpixel order of the display, and can make the image prettier than you can without that information.

[exogen]

It can make it effectively higher-resolution than you can, but that doesn't mean it can make it prettier. It could still look end up looking worse (from the color bleeding effect, for instance).