A lot of them are like this. I liken them to pedos who run child protective services or tradcons who are closet homosexuals. People will often virtue-signal as a means to hide their true nature.
Their "pro-blackness" is just a byproduct of their desperation for white acceptance, validation and approval. This is the clandestine reason why they're so adamant about it.
That's why I don't trust any of these chicks. Especially the ones that are obviously white-identified or mixed race (mixed people always lean towards their nonblack heritage for various reasons). They talk white, live around whites, befriend them, act white, everything about them appeals to the white aesthetic. Because they want access to white womanhood, which is considered to be the highest form of a femininity. Total nonsense, but nonetheless.