If you know anything about Nelson Mandela, this is absolutely ridiculous - even offensive. Mandela rejected the anti-white sentiment of African nationalists such as Nkrumah. In doing so, he synthesized both counter-culture and hegemonic views, for instance by drawing upon ideas from the then-dominant Afrinkaner ("the imagined community") nationalism in promoting his anti-apartheid vision. Mandela was not anti-white. He was anti-apartheid and injustice.
Well ... What did you expect from him back then, "the night was still young" back then, so to speak