Anyway, the most likely reason is that he isn't Polish. A Turk would say he's Finnish and a Russian would say he's Polish for the same reason - both are in the EU and he can work here legally.
Reminds me of stories I read about British fellas in early 1940's, who pretended Polish accent to pick up dates in England. The popularity of Poles (thanks to Polish pilots) put them (briefly) out of the dating market.
The Turkish and Finnish languages are related in some way.
Nah. Unless by that you mean they use the same organs of speech, in which case Polish is related to Swahili.