The article implies that a number of the Black people who left did so because the compliance division was relocated and they didn't want to relocate with it. It doesn't say how many people's decisions were influenced by annoying work crap that they interpreted as discrimination.
This is a really dishonest article. It tries to lead one to believe things (e.g. that 15 Black people left Coinbase because they were belittled in meetings) without stating it outright or making a case for it. Just insinuation spun up from a few concrete situations that themselves are mostly vague or not obviously discrimination (the gun and drugs thing being the obvious exception).