What difference does any of this make?
In 1948, the Jews of Palestine established a nation-state, comprised of all the lands that the Jews of Palestine then controlled, and adding some parcels of land that they took from the Muslims of Palestine in the 1947-1948 timeframe.
Any land controlled by the Jews of Palestine, as of 14-May-1948, the date of the Israeli Declaration of Independence, may be considered the lands and the borders of the new State of Israel, both de facto and de jure.
Victory on the battlefield - defined, in this case, by holding-out against the combined assault of five (5) Muslim neighbor nation-states - and the survival of the infant nation-state of Israel - gave substance to this principle.
The declarations of the provisional rump Palestinian government of those early years - eventually dissolved by the Arabs themselves - and the declarations of the Arab League - and the declarations of individual Muslim nation-state neighbors - held that the Muslims intended to destroy the new State of Israel and to recover all of the lands under its control and return them to Muslim control, after dealing with the Jewish population.
One need do no more than dredge-up one of those old declarations, referencing 'all of Palestine' (meaning the including of lands then comprising the new State of Israel), and then find tactical maps showing the lands controlled by the Jews as of a given point in time [1948, 1967, whatever], to demonstrate in geographical terms, the intentions of the Muslims.
What difference does any of this make?
Title-deed to the land has changed hands.
Written in blood.
Blood, and, more importantly, victory on the battlefield, changes everything.
The Palestinians have been defeated.
They now exist only at the whim and pleasure of the Israelis, who could destroy them utterly any time they wished, so long as they were prepared for an adverse reaction beyond their borders.
Thus, the Israelis define victory.
Thus, the rest of the world defines defeat.
Thus, the Palestinians define a temporary setback.
Time will tell us which of those perspectives is the most rational and sane.