I would disagree as the evidence as of this issue strongly suggests this is not Kal-el per se', to accept this is brainwashed Kal-el/Superman killing thousands first hand and condemning the world to the hell of Apokolips you would have to be willing to accept he is weak enough to be completely rewritten in terms of personality and emotion. This is certainly possible up to a point, but given the extremity of his actions and the strange scars to his eyes, it seems clear Kal-el is essentially dead. What is left is an animated corpse owned by Darkseid.
At this point there is no satisfying way for him to be redeemed or come to his senses as he simply hasn't shown any hint of compassion or humanity. Better he is destroyed as the the tool of Darkseid that he is and the truth of Superman's death five years ago be accepted as his actual death...
What if the 'real" soul of kal somehow was able to return to this corpse. and before moving on, took on darkseid as final act?