Originally Posted by blastoff

In an Airbus autoland, the thrust will automatically come back to idle while the thrust levers themselves will still be in the climb detent (they dont move themselves, only the pilot flying can move them). The RETARD callout is a reminder to physically bring the levers to idle as the auto spoiler logic requires the levers to be in the physical idle position before the spoilers deploy. It's basically an aural input in place of a disagree light--they don't want you to override spoiler deployment and invalidate your landing data.