One does not need be an Aryanist to be a True Leftist, just as one does not need be an Aryanist to be a National Socialist.
What's the difference between Aryanism and the true left? Is Aryanism the racial Ideology and true left the political Ideology?
National Socialists do believe in racial 'quality over quantity'. However, we could technically remove this section:
https://trueleft.createaforum.com/mythical-world/ and still have a viable leftist political ideology for the contemporary world. A person could also believe that all three groups, hunter-gatherers, steppe-herders, and neolithic-farmers, were all ignoble for example, and that there have yet to be quality people to inhabit this planet, and still subscribe to the idea of racial
quality over quantity National Socialism adheres to. Aryanism comes down to whether or not a person believes that the
neolithic-farmers that founded human civilization were in fact the
Noble One\Aryans whose foundations have been corrupted by the other two groups, or not. This is why the mythology of Aryanism goes so well with the racial quality ideas of National Socialism too though. An Aryan National Socialist would argue that the neolithic-farmer is who humanity should attempt to racially emulate, while a National Socialist could simply argue that we need a race of compassionate, efficient, and quality humans, going forward without elevating the Aryans as a model worth emulating.
90sRetroFan will be able to explain this much better than I ever could. Hope I did not confuse you...