from misunderstandings taught in school over what "race scientists" and Nazis believed.

Exactly this. It's a word I've never heard any modern person on the Dissident Right even use. (I could be wrong but I think it's either not true or an exaggeration that the NatSocs constantly talked about it either.) It's only brought up as a convenient punching bag by leftists because obviously to some degree all racial and ethnic groups are blends therefore for the left it's an easy 'gotcha' to say 'Ha you think this nation/group is pure what about the Hugenout immigration?????'.

The bottom line is that purity is not a pre-requisite for ethnic/racial self-determination and advocacy.