there is a big difference between driving a car at 200mph and having textures flying by and playing a FPS game where you walk around and you have time to admire the low res textures.
I think his point was simply that while racing, your not going to notice a lot of these low res textures as you are constantly on the move at a high speed. Things will blur, things will move by very quickly etc. Your mostly going to notice it during replays and screenshots. While playing, not so much.
In an fps game its completely different.