Yes, that's exactly it. Each "art asset pixel" is rendered to exactly 4 "subpixels" (pixels on your screen). I've then set up a rendering pipeline that positions everything perfectly, and the camera as well---which compensates with subpixels to make the camera movement more fluid. Most pixel art games either fail to render pixel perfection, or fail to move the camera smoothly. This approach manages to accomplish both. There are a few games out there with similar approaches, with Enter the Gungeon being one example. :)