A320 Tl
As has been said many many times and will say again.
There are no motors attached to the thrust levers.
The thrust levers move by hand and hand alone.
Any modification to the TL regarding them to be powered back and forth will cost absolute millions and is NOT an option.
On landing the retard retard call is often made 2 or 3 times just look at the video of the 320 landing given on a previous post.
It should be heard only ONCE as this is a fixed call. TL should be at idle prior to touch down. But then none of us are perfect.