If you're implying that blacks incarcerated at 5x the rate of population is evidence of racism, then is men being incarcerated at 10x their population rate evidence of sexism?
I'd say it is. As in, a significant part of the reason men are likely to commit more crimes than women is due to social expectations around how men should act vs how women should. But there's no denying significant biological differences play a part too. The problem with trying to discern whether biological differences play a part in explaining incarceration rates between different "races" is there's no reliable method for objectively determining someone's race.