So why is the discrete period around 2014 a turning point in the hockey stick-like rise of so many proprietary terms and doctrines from the academic left?

For many decades, faculty identifying on the political left maintained a plurality of about 40-45% of the professoriate. At the same time, moderates and conservatives (a category that also lumps together libertarians) maintained relatively stable minority shares.

Starting around 2000, faculty ideology began to shift sharply leftward. In 2004, faculty on the left attained their first-ever outright majority at 51% of the professoriate. By 2010, they had grown to a supermajority of over 60%, where it has remained ever since.