According to Airbus, from below, "... the aircraft is declared in landing phase whereas it is taking off."
By the way, the below link is to Document 28 although "it" (ie some computer software) has apparently declared it as Document 1
From Document 28, page 11, in the NTSB docket:
Party Submission - Airbus
Document 1 Human Performance Group Chairman's Factual Report Filing Date November 19, 2015 11 page(s) of Image (PDF or TIFF) 0 Photos
6.2 If thrust levers are not set for take-off
The condition 1st ENG TO PWR is not set when thrust levers are not advanced sufficiently to reach the take-off position corresponding to FMS thrust configuration, i.e.:
•Thrust levers below FLX detent if a FLX TO TEMP has been entered,
•Thrust levers below TOGA detent if no FLX TO TEMP has been entered.
As the aircraft accelerates during the take-off run, FWC does not compute flight phase 3 but stays in phase 2 in absence of corresponding thrust condition (1st ENG TO PWR not met). When aircraft reaches 80kt, FWC computes flight phase 8 on the basis of the 3 conditions:
•GROUND
•NO ENG TO PWR
•SPEED > 80kt.
Accordingly, the aircraft is declared in landing phase whereas it is taking off.
6.3 Audio-alert RETARD during take-off
Audio-alert “RETARD” has been designed in order to remind the pilot to retard the thrust levers for landing.