I think it’s a bit of a stretch to say that any hair that is ‘relatively long’, ‘not geometrical’, or ‘unnatural color or variation’ is “clearly part of black culture.”
Good thing that’s not what I said. The policy doesn’t exclude all black hairstyles, but many of the hairstyles that would be excluded are sources of cultural/personal identity for black Americans.
it doesn’t seem to be written to target any particular culture
Literally what I spent my first comment explaining - it doesn’t have to be written to target a specific culture to be a racist policy. Oppression is not determined by the intent of the oppressor, but by the lived experiences of the oppressed.