At least on the Game Theory podcast they talked about him as someone who was available, not that they are trying to move him. That makes more sense to me, and I'm inclined to believe that the messaging has been muddied from available to not wanting him.
If the Kings really are trying to move him for anything it would be extremely short sighted. He played less than half the season after shoulder surgery with only 5 games where he got 20+ minutes the whole season. There is no way they could have expected him to look like anything in those circumstances.
(FWIW Devin Carter's Average Net Rating in the 5 games where he had more than 20 minutes is +14.88).