BIPOC is used alternatively to mean Black and Indigenous People of Color (what you’re mentioning here) and Black, Indigenous, and People of Color (which encompasses all non-White people and is the way I usually see it used). I don’t like either though obviously I can’t take personal offense to the former use, either way I think grouping people together because they’ve been discriminated against when group identities are so much more than “we’ve been discriminated against” is counter-productive.