Would an A320 override the autothrottle due to an erroneous radio-altimeter? The pilots of Turkish Airlines Flight 1951 had multiple issues with the auto-throttle setting itself to idle during approach: despite manually adding throttle, the plane stalled and crashed before reaching the runway, from a sequence of events initiated by the reaction of the auto-land system to one faulty transducer. 

The fault was masked because:


The PF was the first officer, his radio altimeter was working correctly.
Autothrottle in the 737 only looked (looks?) at the captain's side. 
The glide path was intercepted from above and throttle reduction was expected.


The F/O was an ex military pilot with 4000 flight hours receiving line training, when the stick shaker activated he immediately gave full throttle. The captain took over command, during which the autothrottle set back to idle again. The plane then stalled and re-applying full thrust was ineffective. Full investigation report pdf here.

The plane was a Boeing 737-800. Had it been an A320, would the autothrottle have reacted in the same way, and set the throttle to idle upon detecting zero radio altitude?
The Airbus thrust levers can only be moved manually. The levers do not move on their own to reflect the auto-thrust setting.

There are detents for the different modes of auto-thrust operation. Regarding the RETARD mode whereby the thrust auto-idles, Airbus doesn't use that (except in autoland).* Hence the callout, "RETARD, RETARD," for the pilots to retard the levers before touchdown.

In a normal uneventful flight, the third detent from the top (CL) is where the thrust levers stay throughout the whole flight from thrust reduction after takeoff, to just before touchdown.

(A320 manual)

* Airbus released an Operations Engineering Bulletin (no. 38) in Mar 2011 (also see the Airbus brochure on the matter). What happened to the Turkish 737 could happen to an A320 due to an "erroneous radio altimeter height indication".

Still, in the scenario given once the pilot flying had applied full power (TO/GA detent) it would have stayed there (unlike the Turkish 737).



Thanks to @user40476 for bringing up this autoland feature, which made me look up further details.