You find one small point about one particular kind of crime and think that overturns the mountains of other evidence in that particular article.
What other evidence? Try quoting some examples. Ferguson arrest rates? How much is driven by pay-per-use legal system that screws over the poor? How much is actually race? You can't really know from the data presented. There is no data in that article that actually supports the claims made. The writer simply assumes causal relationships because it suits the writer's bias.
Moreover, you don't take that point about drug sales and think for a second WHY black people engage in different kinds of sales.
The why is fairly obvious: communities with widespread poverty don't have the cash to buy drugs so dealers are forced to sell to strangers.
However, this has nothing to with policing and you cannot claim that the police unfairly target blacks simply because blacks are more likely to engaging in crime in public. It also re-enforced my point about poverty being the real problem and skin colour is a spurious correlation.
it's because social systems are failing them far more than it fails white people.
Another baseless assertion.