No, that was propaganda the Germans were fed, though even then it was never about "Whites" (just consider the disdain for the British and Americans), but "Germans". But that wasn't in earnest, ever.
Though you can say it was about racial superiority, it was of a "race" that didn't exist yet. From https://archive.org/details/TheOriginsOfTotalitarianism/ page 412:
> The famous "Right is what is good for the German people" was meant only for mass propaganda; Nazis were told that "Right is what is good for the movement," and these two interests did by no means always coincide. The Nazis did not think that the Germans were a master race, to whom the world belonged, but that they should be led by a master race, as should all other nations, and that this race was only on the point of being born. Not the Germans were the dawn of the master race, but the SS. The "Germanic world empire," as Himmler said, or the "Aryan" world empire, as Hitler would have put it, was in any event still centuries off.
And don't forget: https://en.wikipedia.org/wiki/Nero_Decree
> Moreover, according to some around him, Hitler came to view the German people as having failed him, unworthy of their great mission in history and thus deserving to die alongside his regime.
I think you could say for Hitler, it was only about Hitler. For his inner circle, it was about Hitler and them, and so on. Each layer used and deceived the outer layers.