Nonsense.
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Idont know anything about Polish colonization, just Kosmas mentioned in the chronicle that Břetislav brought the captured Poles who settled at southwestern Bohemia.
Foreign colonization was done almost just by Germans only. Somewhere i read that abong the Bavarians, Saxons, etc where also some Dutch and Flemmish people.
Interesting exception was a case of Sedliště and Řepiště, 2 villages at Silesia, what were settled by the Sorbs
Article about the colonization (in Czech language)