That's the number of UNARMED blacks, not the total number of blacks. The total number of blacks killed by police in 2019 was 235. There are about 44 million blacks living in the United States.
Heather MacDonald is the expert on this subject:
https://www.manhattan-institute.org/the-myth-of-systemic-police-racism
In 2019 police officers fatally shot 1,004 people, most of whom were armed or otherwise dangerous. African-Americans were about a quarter of those killed by cops last year (235), a ratio that has remained stable since 2015. That share of black victims is less than what the black crime rate would predict, since police shootings are a function of how often officers encounter armed and violent suspects. In 2018, the latest year for which such data have been published, African-Americans made up 53% of known homicide offenders in the U.S. and commit about 60% of robberies, though they are 13% of the population.
IIRC, the Washington Post updated their estimate for the number of unarmed blacks killed by police in 2019 from nine to 27, after the linked MacDonald piece was written.
IIRC, the Washington Post updated their estimate for the number of unarmed blacks killed by police in 2019 from nine to 27, after the linked MacDonald piece was written.