How did Hitler support the Aryan's?

There really is no such thing as "Aryans" as in a geographically located peoples or a recognized racial group. The word Aryan is derived from Sanskrit word "arya" which means "honourable, respectable, noble". The Western notion of Aryan did not originate until the late 19th, early 20th century. The Nazis ideal of a pure "Aryan race" derived from the belief that the Nordic peoples represented the "purest" form of the original racial stock known as Proto-Aryans The Nazis declared that the Nordics were the true Aryans because they claimed that they were more "pure" (less racially mixed with non-native Indo-European peoples) than other people of what were then called the Aryan peoples (now generally called the Indo-European peoples).

So in reality, Hitler did not "support the Aryans", the Nazi party believed that they were racially superior to other European peoples, and that they (The German Peoples) represented the purest form of white humanity.