AlexL
You don't quite have the A320 A/THR system right.
In the Airbus - during the apporach - the thrus is at a normal approach setting, then during the flare the thrust comes back to idle, then once landed the thrust spooled back up again
On the airbus the thrust will idle, and the aircraft land without the thrust levers being pulled back.
On an Autoland RETARD mode engages at 40 ft. RA and reduces thrust to Idle at the appropriate height. It would remain at Idle even if PF did nothing with the thrust levers. "Retard" callout happens at 10 ft. RA as a command to PF to move the T/Ls.
On a manual landing the A/THR maintains Vapp and if PF does not move the T/Ls the A/THR will increase thrust to maintain Vapp as you trundle down the runway. It does not reduce to Idle. PF retards the T/L to Idle during the flare - the system calls "Retard" at 20 ft. RA as a reminder if PF has not already moved them.
The aircraft then needs a further pilot action to satisfy the spoiler / autobrake logic.
Not true - suggest you read PBL's post No. 585 on page 30.
Cheers TP