There's no such thing as “the PC movement”; every ideological movement has ideas of correct usage of terminology related to the ideas that motivate the movement, the term “political correctness” has been used as a derogatory term for different of those ideas among different and unrelated ideological movements at different times. (e.g., in the 1930s-1950s it was used in a New York times article describing Nazi drive for uniformity in expressed ideas, as well as by American Socialists attacking the American Communists.)
However, attacks against expression of anti-sexist and anti-racist ideas as “political correctness” by the same segment of the American Right has been extremely popular twice, the first in the 1980s-1990s, and the second we're in right now.
What if you happen to want to signal solidarity with the alt-right crowd? Why assume a flamboyant alt-right-style rant is an accidental coincidence? (Nto sure of the 1990 date is for the commandments, the annotations, or both, but in ant case, while it wasn't called the alt-right then, the subculture and attitudes certainly existed at the time this was written; 1990 would have been well into the first wave of it's vigorous embrace of flamboyant attacks on “political correctness” as a signal of group identity, which started in the mid-1980s as I recall.)