You are, due respect, basically just making this up. Companies publish investigator reports of bias and discrimination somewhat regularly. It's possible that Coinbase contractually can't disclose the reports they've already commissioned --- in which case they probably ought not to have tried to refute the article with them --- but they can certainly commission a new one that they can disclose. It's a 600+ employee company; the cost of the report is a rounding error.

As it stands, the kernel of Coinbase's defense here is "we paid for a secret report and it says we're great". Reasonable people can find that response unpersuasive.

Redaction is commonly used on sensitive, non-germane information - this is not an unsolved problem.

This stance is so ridiculous on it's face that I'm more likely to believe that you're Brian Armstrong than someone else.