I think you're missing the point. When racial justice advocates refer to "whiteness," more often than not, they are using it in a manner that's intended to be synonymous with the term "white privilege." This is based on systemic and social/cultural realities for BIPOC, although I doubt you're willing to acknowledge that given how you started off this article.

I do agree that the idea of "white privilege" (or "whiteness") shouldn't be automatically equated to "white supremacy." There should be a distinction made; and the onus is on whoever is using the term "whiteness" to specify what they mean by it. If somebody is using the term "whiteness" derisively or pejoratively in order to deride someone for the mere existential state of being White per se...then I'd agree that's dangerous and needs to be called out.

I tend to view the term "whiteness" as rather vapid, when used in this context -- and I find the term "white privilege" to be more straightforward and less confusing/ambiguous.

But somehow I doubt that you'd find it appropriate to use the term "white privilege," either.