My claim is firmly grounded in the "speculation" (as you characterize it) that the Nazi regime preferred "Aryans" to Slavs. In the face of the Soviet advance, Berlin's leaders were were more than happy to let the burden of death fall to the Slaves they considered to be Üntermenschen.
...and yet you've failed to answer why Hitler sent tens of thousands of blue eyed, blonde haired Germans to fight side by side with the mahometans in the defense of Vienna, his second city to Berlin alone and capital of his beloved birthplace, Austria. The inescapable fact that you wish to avoid, of course, is that some 21,000 mahometans joined the SS and fought with Hitler in defense of the heart of his empire till the bitter end.