Black motorists are also much likely to be pulled over, even in situations where police do not see the race of the person they are pulling over. Or when the officer is black.
I don't think anyone is denying the racial element, but it's easier for me to see it as a symptom of intergenerational poverty and disenfranchisement rather than systemic malpractice from individual officers.
In this case, I wouldn't want to downplay the progress we have made on policing the police. The only reason this study exists at all is because of the proliferation and availability of police body camera footage. That's a big win for everybody.