Good point.
According to the NRO story earlier this week the count was conducted amid planned chaos. They had 100 people counting and 5 people watching. The watchers said the counters "corrected" bad ballots, counted unsigned ballots, and threw away good ballots.
The watchers called more people to watch, the counters called lawyers (because there were white people in there), and somebody called police. All the while the fraudulent counting continued.
In the end Detroits population falls but the number of voters continues to rise.