There shouldn’t be any dispute over land ownership. God granted Title and Deed to Israel 4,000 years ago and recorded it in the best Registrar of Deeds known to man:
Genesis 15:18
In the same day the Lord made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates:
That same Title was transferred through Isaac by promise. Not Ishmael!
Sadat’s been dead a long time. His aide has no basis for this other than a bald assertion.