The word “Master Race” is clearly equivalent to terms which were used by Nazis and so are today’s far right wing and alt-rights.
There are other communities which created similar narratives, especially from the 4chan side, and I think the origin of “PC Master Race” comes from there.
Language is more than just what Orwell thought it is.
Language can be harmful to others and recreate structures, which harm others.
I wish you wouldn’t use the word “harm”. I find that term hateful and hurtful.