It's a department at a company. You're not allowed to say that 'people of ethnicity X will never be given a leadership position'. That's blatant racism.
"the white folk"? That's pretty close to "you people"/"those people".
I really don't like this trend of painting everyone with white-ish skin as a homogenous oppressor class. It's pretty clear to me that a diversity department that explicitly bans white people from leadership positions will not represent my interests if I am discriminated against.
How stupid can you be to post a "no white leadership", in writing?