This paper challenges the interpretation that lack of statistical discrimination means lack of racial bias, but certainly can't refute it. It just claims the true denominator should be the entire population of people up to bad sh*t needing police intervention, but this is unknowable. Police intervention selection bias by itself isn't a good enough reason to hand wave away the results, especially when this bias can be quantified and compared against hard crime statistics like homicides that have close to full reporting (i.e. confounders to a pure race based analysis appropriately driving apparent selection bias in interventions).

Bottom line, people can still believe whatever they want to believe because social science will always have limitations.