If you actually could be bothered reading the article - they are comparing stop+ticket for speeding vs camera driven tickets for speeding. They explicitly ensured that they were doing a like-for-like comparison to avoid responses like this.
Speeding tickets issued by machines: speeding tickets are issued to black people at the same rate they’re issued to white people
Speeding tickets issued by police officers: tickets are issued at overwhelmingly higher rate for black people than white.
There are two options:
* black people drive worse than white people, but only when police are present and cameras are not
* police are racially biased when enforcing traffic laws
Given the overwhelming evidence of racial bias in other parts of policing I don’t see any - non-racist - reason to believe that the former is more likely than the latter.