As of my last update in September 2022, NASA's planetary defense mission, the Asteroid Terrestrial-impact Last Alert System (ATLAS), was still operational and actively tracking asteroids. Therefore, the information you have about NASA shutting down ATLAS may not be accurate or may refer to a different planetary defense mission.

Please note that information can change rapidly, so I recommend checking reliable and up-to-date sources to confirm the status of NASA's planetary defense missions and any developments in this area.