Probably should have just said POC in my parent comment to skip all this side discussion, but the repetition is the point. - it's used for emphasis.
From wikipedia:
"The term aims to emphasize the historic oppression of black and indigenous people, which is argued to be superlative and distinctive in U.S. history at the collective level."
From wikipedia:
"The term aims to emphasize the historic oppression of black and indigenous people, which is argued to be superlative and distinctive in U.S. history at the collective level."
https://en.wikipedia.org/wiki/Person_of_color#BIPOC