Autothrust is still available, and when the autopilot is disconnect will never command idle thrust no matter what law the FBW is in (assuming no exotic failure combination).
If you flare and leave the thrust levers where they are they will happily give you more power and you'll fly along the runway at 10'.
The thrust levers are normally closed before you hear the 'Retard' call which is triggered by the Radalt, so you would get neither the 50,40 etc nor 'Retard'.
Possible distraction in this scenario could be an autothrust increase/decrease leading to an unexpected pitching moment.