I remember reading him once describing the Aryan peoples as extinct, but as partly descendant of aryans, the german people had a duty to preserve their own stock.

Heavily paraphrased of course, the party used Aryan differently in different contexts, sometimes it meant simply "european". Sometimes all aryan descendants could join in on the fun. Sometimes it was purely political (honorable aryan etc). Sometimes it refered to a mythical proto-european man (hyperborean).

I think it's important to remember that "white" is simply a fashionable term we use currently, and that our genetic stock has been called many names and divided up in many different ways. For hundreds of years, "christian" was a term reserved for whites, as there were no other kind. closely related non-whites had their own monikers, eg gypsy, jew, saracen etc. A common strategy for race deniers is to dig into the semantics around racial terms, so this shit gets a muddled quickly, and translated sources end up misleading.

TakingNames response makes a lot of sense. I'm wary of the way hitler is deified, expecially given the ease so many contradictory opinions are assigned to him, but this one broadly makes sense to me.