Spending time teaching people to use people of color instead of black is just performant. Actually firing a recruiter that immediately throws any black resume into the trash is real change.
This seems illustrative of the "boogeyman" points that many commenters are making. I think it is a very small number of people who don't want people to call black people "black", and that the majority of liberal people would find the notion "you can't call them black people" to be ridiculous.
Are there people who believe this? I'm sure there are, but I think they are a vocal minority.
"People of color" is a broader term than "black people", and is meant to replace the (pretty widely accepted as) offensive "colored people", not "black people". I feel like it's useful to have a non-offensive phrase that means "nonwhites" without being defined in terms of white people, but maybe I'm just too woke to reason effectively ¯\_(ツ)_/¯