There was no “State of Pal’istan” created by any post war treaty.Palestine was a state created out of post war treaties. The Mandate did not commence until about three months after the signing on the Treaty of Lausanne. Palestine had to be there before the Mandate could start.Palestine was an "entity" created by the British Government for assuming responsibility and control over the territory.
There is no “State of Pal’istan” currently.
In anticipation of your nonsensical insistence that the Treaty of Lausanne created your imagined “State of Pal’istan”, the answer is no. That has been the same answer every time you have made that nonsensical claim.