I think you may quite fairly disagree, or claim that the author is not representative of black physicians, or anything else — but discounting them by their associations and other political beliefs which are actually very common is not a real argument.
You’re just saying they’re a “Bad” person and so can’t be trusted. I think you should debate ideas, not people. Otherwise it’s just tribal politics.
The title is an argument from authority against mandated implicit bias trainings, and GP's point attacks that authority.
I recommend you walk around an american city and talk to them sometime, you'll learn way more than on the internet.