Step 1, get rid of UNRWA.
He's right, if you clarify it as: Get rid of the premise of UNWRA.
There were many population transfers in the 1940s. The only one that to this day believes that they have the right to, one day, return, and reverse the events of the 1940s are the Palestinians.
No muslim or hindu that was forced from his home when British India was split is living in a refugee camp to this day. Nor any German expelled from Danzig...