I think he was referring to dumping all the Arabs from west of the Jordan to East of it to allow space for Jewish settlement.
No one, not the British and not the Jews, were moving Arabs from any place to any other place. And there were no such plans from any legitimate source.
There was no restriction on Arab freedom of movement what so ever. The Arabs, many from neighboring countries, flooded the Jewish areas as the Jews were building and creating jobs and a robust economy.
Only Jews were restricted in many many ways.
Take the largest city in Israel, Tel Aviv- only one hundred years ago
In that case, he was fabricating. There never was such a design. 20% of the population of Israel West of Judah and Shomron are Arabs and enjoy full citizenship, as the Irgun promised them. Nobody lifted anyone up or dumped anyone anywhere. The massive exodus from Israel was a panicked reaction to the extravagant lies being told about Deir Yassin, and was entirely voluntary.
As for what actually occurred at Deir Yassin, see Revolt!, introduction (only read it in the original Hebrew, so don’t ask me what page to find the passage in the English translation).