There is no proof that white candidates are hard to interview there.
That quote sounds like the kind of thing that could easily be an immature employee who doesn't like the idea of a "VP of diversity", or doesn't like the tone of the VP's slides, taking something small and blowing it out of proportion.
Like, they tried to recommend a friend of theirs for an open position and the friend didn't get an interview and suddenly that n=1 case becomes "OMG! They won't let us interview white candidates!!"