> Was Schenker promoting a race that he didn't even belong to?
I think this is an error, trying to map our understanding of race onto the past like this. I don't know what race Schenker thought of himself as. He was Jewish, and he consistently asserted the natural superiority of german people and culture. That doesn't cleanly reconcile with any conception of race that I've come across, which indicates to me that those conceptions are not a useful lens here.
My goal wasn't to start up the is-schenkerian-analysis-racist-or-not quagmire here. It was to point out that I believe the author of this essay has misunderstood or misrepresented a more nuanced conflict for their own purposes.