|It seems that the study in question lumps in the vast majority of FOIS's which are suicide by cop by mentally unbalanced persons, who, being more or less evenly distributed by ethnicity, are majority white. If you back those out, you get results in agreement with BLM's thesis.|
This article has a Correction and Letters. Please see: Making inferences about racial disparities in police violence - January 21, 2020 Young unarmed nonsuicidal male victims of fatal use of force are 13 times more likely to be Black than White - January 21, 2020 Correction for Johnson et al., Officer characteristics and racial disparities in fatal officer-involved shootings - April 13, 2020
This and other articles is why I don't spend time reading ZH .