I wouldn't say that "historical policy" doesn't include Poles, but yes, the popular view of the Holocaust is dominated by the organized extermination of the Jews (and some other groups) in the concentration camps. Non-Jewish Poles were also Nazi victims, but according to https://encyclopedia.ushmm.org/content/en/article/polish-vic..., they were mostly murdered during the invasion of Poland or immediately after, so it's much more difficult to estimate the total number of victims. Also, according to https://en.wikipedia.org/wiki/Holocaust_victims, Soviet civilians and POWs are the second and third largest groups (not that it matters much, especially since Poland is a much smaller country).