That is pure Holocaust Denial. Hitler intended to liquidate the Slavs, and 9 million souls weigh no less than six million. And some Slavs collaborated. As Hans Frank said, we will make mincemeat of the Poles and Ukranians. It’s a shame you can make such statements, which would be condemned if said about the Jews
Practically, the Nazis could not have liquidated all of the Slavs. I am not aware that they planned to. They planned “Germanize” many Slavic lands, to deport their populations to Siberia and to use Slavs as slave labor. I do not deny that millions of Slavs died in the Holocaust. However, at the end of the war; Eastern Europe remained largely Slavic but was almost devoid of Jews. Slavs were not exterminated. Jews were, and as it happens they were often killed by Poles, Ukrainians, etc., rather than by Germans.