Quote from Linktrained:
To have to alter the R/W on "short finals", to fly over the grass R/W at Habsheim, whilst still at Flight Idle, probably meant a loss of some of the intended or planned altitude.
Why would the a/c have to lose height when the PF was trying to reduce speed? And on an A320, the FBW specifically counteracts the tendency of an a/c to lose height in a turn.