Yes, it was.
> There were Nordics, Jews, Irish, Eastern Europeans, and Southern Europeans.
The existence of those groups, and the fact that then-current concepts of whiteness would exclude some or all of them, doesn't change the fact that “White” was the identity of the dominant racial group, and had been for quite some time by the 1920s.
> I should also mention, this is the deeply disturbing origin of the progressive movement in america.
No, it wasn't. Oh, deeply disturbing it was, but it wasn't the origin of the progressive movement in America. It's true that the eugenics movement occurred within one of many (often overlapping in time) movements that took the name “progressive” in US history, but it wasn't the first, nor one historically strongly connected to any of the modern groups with the name.