While there were certainly collaborators, given the fact that Poland had no government, pending the enslavement of their non-Jewish population, I don’t see how they could be singled out. Any other nation, save the Finns and Danes, sure, with a special mention to France.
BTW, this article was meant for all the Eastern euorpean countries that want to enter the Nato group...it really has a sinister subplot that has nothing to do with Hitler or the Poles!