You clearly did not read the story as the woman voluntarily left her job, it was not because she 'fell short'.  
Perhaps you just never made it high enough in your career to interact with enough senior level colleagues. Speak to ANY black Bay-street lawyer (my mother being a black corporate lawyer) and they all have similar experiences.

No on is blaming white people for not succeeding but wake up to the world honey boo boo because bias is alive and well in hiring practices and if you don't think that's a problem then you simply are choosing to remain ignorant.