https://www.bbc.com/news/world-us-canada-52993306
Which started in the 1970’s
https://medium.com/handwaving-freakoutery/the-two-confusing-definitions-of-racism-2d685d3af845
It may have been around in academic circles as par of the “R2” Marxist/Collectivist form of “racism”, but I do not recall seeing it in much general - nonacademic - writing on the subject until very recently, after the BLM movement.
And outside of such circles, I don’t think the term has been widely used - until now in some circles.
The links you provide are a good point of demonstration though - how Marxists seek to change the language in their agendas to change the culture.