That's incorrect. You're thinking of a low pass filter, for which the Red supports a variety of filters that you can switch. What the parent most likely is seeing is bad nearest-neighbor downscaling (e.g bad selection of downscaling algorithm).
Maybe photo vs film terminology? On my canon 5DSr, it is definitely the physical antialiasing filter that is removed to allow improved sharpness per pixel at the expense of greater risk of moire.