Pretty easy to understand if you swap what the software is detecting to "asteroids which are on impact course with earth". Basic functionality is to detect aste

Pretty easy to understand if you swap what the software is detecting to "asteroids which are on impact course with earth". Basic functionality is to detect asteroids which are on a collision course with earth. The fact that no undetected asteroids struck earth doesn't mean the software worked or didn't work, nor does it mean that detecting asteroids which are on a collosion course with earth is not basic functionality.