Were the Arab immigrants to Palestine "colonialists?" "Settler colonialists"? "Illegal immigrants?" Or "Palestinians"?

From the Palestine Post, November 22, 1933:

There is no doubt that there was significant Arab immigration to British Mandate Palestine in the 1920s and 30s. Yet unlike the Jewish immigrants at the time, the Arabs are never referred to as "colonialists" or "settler colonialists" as the Jews are.

In fact, in a true irony, today they are considered to be "Palestinians" - even though most of them lived in British Mandate Palestine for only 20 years or so. And they took the name of the people who were called Palestinians at the time. 

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