Ideological intolerance is part of it, but it's clearly not the only part, given that the very first point in her slide is "this is not work for white folks to lead", i.e. she doesn't want white allies. I don't see how much more explicit this lady can make the fact that she hates white people as such.
As for German or Russian philosophers - that seems far fetched. This is an American phenomenon, and in its explicit and mainstream form, it is a fairly recent one.
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.
Do white-passing gay people not get to have a say in diversity issues?
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.
As for German or Russian philosophers - that seems far fetched. This is an American phenomenon, and in its explicit and mainstream form, it is a fairly recent one.