I think that you need to prove that is systemic. It could be, but as stated it is just a statistic.
Yes, and a quite damning one.
[snip unrelated stuff]
And there are consequences of past systemic racism. Many of the times CEO's gain a position from reputation (or family reputation), have benefited from educational opportunities, wealth, etc. gained by their parents. But this is not systemic racism. It is the consequence of past systemic racism.
Oh? So tell us when systemic racism was eliminated? In the past 5 years? 10 years?
Fortune 500 companies by and large are not bastions of nepotism. Once they reach a certain size, most smart owners realize they have carried the ball as far as they can and need outside help to keep the company growing. Besides, CEOs are nominated and elected by the board of directors and/or the shareholders.
The burden is on you to explain why only 1% of Fortune 500 companies have black CEOs. That means that only 5 CEOs out of 500 are black. Why is that?