The God Butcher didn't transform though. He just saw past his blind need to punish the gods long enough to actually realized that he could use his wish to bring back his daughter instead. Why would he bring Jane back? He didn't give two shits about her. Thor was the one that had actually earned his respect and opened his eyes.And the God Butcher was right just like Killmonger was.
If they wanted to show the transformation of the God Butcher, he would've wished for Jane to be cured since he wouldn't be there to raise her since he was dying and he would see Thor as a god different than the ones he encountered...but whatever.