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).
I think he was referring to the FEAR of forcible eviction, not its actual happening.