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https://en.wikipedia.org/wiki/Jewish_exodus_from_the_Muslim_...
I'm guessing that is what they are talking about.
The population of Israel approximately doubled from 1949 to 1965. It did so because of immigrants from places like Egypt, Iraq, and Yemen.
The overwhelming majority of those immigrants were not voluntary, but were forced to leave by formal expulsion (Egypt, semi-formal in Iraq); revocation of citizenship (Algeria, Libya); massive official discrimination (eg Syria); or simple mob violence (Libya again, Tunisia, Morocco). In Egypt there was a wonderful trick of forcing expellees to sign papers saying their departure was "voluntary".
In countries where only mob violence was involved (Morocco, Tunisia), some Jewish communities remained. Then there's the interesting Lebanese case, where the Jewish community thrived until targeted during the civil war.
But yeah, don't pretend that the complete nonexistence of Jewish communities in Yemen or Iraq or Egypt happened by chance.
Hundreds of thousands of people, whether Palestinian, Jewish, Desi, or German, don't tend to move en masse without violence.
People who hold a mental model of Israel as a White European Colonizer seem to simply reject the idea that it absorbed more than a half million fleeing Black & Brown Jews in its first decades of existence. If they even accept that 90% of the Jews in Arab countries suddenly left without their property and money, they insist that it was a voluntary move due to inherent Jewish disloyalty to their broader societies.
Interestingly, the term "ethnic cleansing" wasn't coined until the 1990s. The 20th century push for ethnic self determination came with an understanding that people would have to be moved to form concentrated and contiguous populations that could self determine. Millions of people were forced to move in the 1940s to establish India, Pakistan, and a more Slavic Soviet Union.