I think he's asking for evidence of Google's racism, not racism in general. Google can't 'fix racism' to hire more African Americans, they can only prevent it in their hiring process.
Then we get VCs pledging to take deliberate steps to address the problem and they turn out to be vaporware.
However you didn't claim that no actor was being racist regardless, you claimed that the redliners were being racist, which is true. So go after them and their children, not Google.