This is absolutely incorrect. I service my fluid this past spring/summer. I did a complete flush on mine. The dipstick on the 6R80 transmission is on the transmission on the passenger side. It looks like a bolt. The dipstick is on the underside, inside the bolt. When cold, the fluid should be at the bottom of the grid. When checking hot, get fluid temp. Between 179°-195°. If you can’t get it closer to the higher temp end, leave the fluid a little lower than the top side of the grid because the fluid expands.