They retracted the paper because of political pressure, not because of any factual errors (this is pretty clear in both the timing of the retraction and the retraction statement).

> While our data and statistical approach were appropriate for investigating whether officer characteristics are related to the race of civilians fatally shot by police, they are inadequate to address racial disparities in the probability of being shot.

That's not what my comment addressed. It addressed the probability of non-white officers shooting to kill being higher than that of white officers. I think that conclusion is still supported by the paper (as in the last line of your quote).