Why do you think so? Because of the scaffold? It will be a major fuck-up in history of engineering if the the deckhouse is modified at this stage, that is the metal beams and plates are torch cut off and reshaped and welded back in mid-air with all antennas being removed and re-installed and cables being rerouted.It appears the smokestack is undergoing modifications because of performance issues seen during the recent sea trials. Exhaust gases from the funnel have been interfering with the radar and satellite comms on the top of the mast.
So we can likely expect at least 1-2 additional sea trials following these adjustments before the carrier is commissioned.