If what was mentioned is true, then what is the answer if the Jews demand their half of the dates or its accumulated value over the years?

The agreement of the Prophet, peace and blessings be upon him, with the Jews was a labor contract, stipulating that they would work the land in exchange for half the produce. The Prophet, peace and blessings be upon him, and his successors fulfilled their part of the agreement. When the Jews violated the covenant, Umar expelled them based on the condition: "We may, if we wish, expel you from it." And when a worker's task is completed, he is not entitled to demand wages without work.