Relative to OTL it might have a lower body count but the Holocaust in Poland started September 1st 1939, by 1st Jan 1940 it was already over 100K.
Back in 2015, I posted the following in response to the Author
(Begin copy)
Essentially those in German-occupied Poland, Denmark, Czechoslovakia, Belgium and Germany itself. Those in Norway can get away pretty easily, while those in France and Holland mostly live in areas the Germans have never conquered. Not quite sure what that comes to - largely because I'm not sure which definition of Poland is used in counting up victims of the Holocaust. Lots of ethnic Poles are under Soviet occupation in what was prewar Poland right now, and in OTL the area was then captured by the Germans and they then will mostly have been murdered.
OK using
http://www.jewishvirtuallibrary.org/jsource/Holocaust/killedtable.html and cutting Poland's Jews killed in half (the west was more populated, the east, I believe more heavily Jewish, probably cancel each other out ('ish'))
So Number killed in OTL, *guesses* on percentage relative to OTL killed (assuming the Nazi don't conquer any significant additional territory and end up with equivalent percentages where they do) and result.
Poland: 3000K * .5 = 1500K
Baltic: 228K * 0 = 0
Germany/Austria: 210K *1.0 = 210K
Protectorate: 80K * 1.0 = 80K
Slovakia: 75K * 1.0 = 75K
Greece: 54K * 0 = 0
Netherlands: 105K * 0.1 = 10K
Hungary: 450K * 0 = 0
White Russia: 245K * 0 = 0
Ukraine: 900K * 0 = 0
Belgium: 40K * 0.3 = 12K
Yugo: 26K * 0 = 0
Romania: 300K * 0 = 0
Norway: 900 * .5 = 450
France: 90K * .05 =4K
Bulgaria: 14K * 0 = 0
Italy: 8K *0 = 0
Luxembourg 1K * 1.0 = 1K
Russia: 107K * 0 = 0
I get 1.5M Polish Jews + 393K Jews from elsewhere. (yes, I know my percentage in FR/NL/BE may be a little high
Which means that just as iOTL, the 5.7M Jews is round up to 6M, here 1.9M will be rounded up to 2M.
For non-jews, no Soviet POWs, and fewer Poles almost no Roma/Gypsies, but a lot of the other numbers (Freemasons, political opponents, Homosexuals) similar. However the first two represent by far the largest part of the 5 million non Jews.
Thus, my *guess* numbers are 1.5M Jewish Poles, 1M non-Jewish Poles, .5 M non-Polish Jews and .5 M who are neither Polish or Jewish.
So Jews OTL:6M, TTL:2M, Non-Jews OTL: 5M, TTL 1.5M: Total, OTL:11M, TTL:3.5M
(End Copy)
There were a number of responses and discussion from it, and some minor tweeks, but I don't think the Author had a problem with the estimate. (And I don't remember if Slovakia actually sent their Jews, that might affect things in post-war relations)
The *other* thing that comes out of it is that without the loss of Jews in Ukraine, Belarus and the Baltics *and* gaining Eastern Poland (with few Jews killed in the fighting), Stalin's Soviet Union now has more Jewish subjects than *any* leader has *ever* had OTL. (Most of the Czarist lands *plus* population growth). When the Jewish move to Palestine happens because of the horror of this TL's Holocaust (which even if a third of OTL, is still absolutely horrific) this means that Stalin by opening the faucet for Jews to go to Palestine can make Palestine even less governable than OTL. I even raised the possibility that in trying to keep Palestine from being flooded by Jews that a side effect could make Cyprus Plurality Jewish at least for a short amount of time!