The author is wrong to claim that the social construction of whiteness is a "view." It's a historical fact: most European immigrant groups -- Irish, Italians, Slavs, etc -- were explicitly NOT considered white when they first began arriving to the US. It was only when they had adopted the racism of "whites" *and* became demographically convenient that they were allowed into whiteness.
https://andscape.com/features/white-immigrants-werent-always-considered-white-and-acceptable/