He hasn’t said any such thing, nor would such a statement make any sense. Even under UNGA 181 the eastern section of Jerusalem would not have become “Palestinian”.
Thus far the heir to the throne has said nothing beyond condemning Hamas’s atrocities on October 7th and mentioned the tragic loss of life in conflicts in the Middle East, the need for humanitarian aid and the release of the Israeli hostages.
“I remain deeply concerned about the terrible human cost of the conflict in the Middle East since the Hamas terrorist attack on 7 October. Too many have been killed,” William said.
“I, like so many others, want to see an end to the fighting as soon as possible. There is a desperate need for increased humanitarian support to Gaza. It’s critical that aid gets in and the hostages are released.” – Prince William as quoted by the BBC.
Reasonably sensible and middle of the road.