Yeah it seems like everybody will admit that it's there until specifics get pointed claimed and then, no, you can't claim THAT one, try again, etc.
I think it's bullshit myself, I mean, what's the problem, we got no problems apparently with pointing out every OTHER influence in/to "jazz", but "African", even as a residual/subliminal/genetic memory/whatever seems to upset a lot of people for some reason other than just acknowledging it in a very general sense. It's like an abortion or something, let's...just not talk about it, we had it, now let's move on, please. Please.
Me, I'm fine with it, makes perfect sense to me, fits in with what I see and hear, and have seen and heard. But I'm no musicologist, that's for sure, so what do I know.