Some Pollock may have said 4 million, but in a google search, every one of the top 10 pages give me a figure of roughly 1 million, so I'd think this is the figure accepted by the establishment. I don't see 4M reported from any media source for Auschwitz

1 million for Auschwitz still seems a bit high, as I suspect the total number of Jews killed in all camps was probably closer to this number than the stated 6 million. Tarrock has suggested the 271K red cross figure for Auschwitz which does seem more plausible.

But I think you are quibbling over semantics here, at least with respect to the numbers. Yes this number is likely exaggerated, but I doubt it matters in terms of how this history is perceived. Do you think anyone would feel substantially different about the holocaust, Jew, Neo-Nazi, or anywhere in between, if the official number were 1, 2, 3, 4, or 6 million? I suspect the precise number here matters very little to most people in terms of how they view this event, and most people probably don't even know what the official number is. Hitler rounded up all the Jews, put them in camps, and a big number died, is what I expect most people would remember if you picked people off the street and asked them what they had been taught