Nobody even knows what "white nationalism" means, probably because it was invented by the left to discredit the right, as you point out in your opening sentence.

If it means defending white people from assault via the mind poison of CRT, or defeating those intent on deliberately making white people a minority via uncontrolled immigration (the so-called "great replacement"), I'm all for it. Still, such a rational means of defending one's interests could use a different term.