This is important information--you're absolutely right that the original claim is wrong because it's referencing numbers not rates.

However, while we're offering more accurate information, it's also worth noting that the rate of homicides committed by black Americans is on the order of five times higher than by non-Black Americans (https://ucr.fbi.gov/crime-in-the-u.s/2019/crime-in-the-u.s.-2019/tables/expanded-homicide-data-table-6.xls). Note that the table classifies most Hispanic people as "white", and breaks out "Hispanic" ethnicity separately, so the denominator for "white" here is about 75% of the population, not the usual 60%.

If police are doing their jobs properly (we obviously have numerous high-profile cases where they weren't), then you'd expect shootings to be higher among populations that have a higher fraction of more violent members. If all else is equal (it isn't), and shooting people is ever justified (occasionally is, but police need WAY more training in, and tools for, other ways to solve problems) you might expect a justified shooting rate to be as high as 90 per million among black Americans.

There are lots and lots of caveats, too many to get into here, but the primary point is that unless police are shooting people at random save for their race, reporting differential shootings by race without even mentioning differential violent crimes by race is also quite misleading.

(I do think you are correct, however, in reporting that social justice advocates are concerned by the raw 2.5x-ish differences in rates that you report.)

(I do not understand why social justice advocates typically aren't even more alarmed by the raw 5+x-ish difference in committed murders. This is not a sign of a society that is serving its members well!)