Surely one is supposed to slow down from VApp over the threshold to touch down at Vref (or Vref-x it's depending on type) - NOT stay at VApp - that would exceed predicated landing distance. That said, younger pilots (non AB) do seem to be paranoid about getting below VApp, and I have even seen them ADDING thrust while they flare to prevent speed going below VApp (and rolling out very very long or with heavy braking) It would seem to me that an Airbus would rightly chastise this dodgy practice, and correct technique of closing the thrust during the flare would work just fine,
Another slightly unusual aspect is that a tailwind normally slightly increases airspeed in ground effect, not decreases.