You seem to be suggesting that you don't believe different racial and/or cultural groups have intrinsically different qualities, and that the differences in outcomes can only be attributed to racial bias in the system.
I can see how I gave that impression. I should have worded it better.
Any group of individuals who share a common experience or a common history will share common characteristics. As you point out, certain Asian groups perform better academically than average because their culture demands it. Certain African populations perform better athletically than average because their population has selected for it.
But that's not the same as success in life. I am good at maths and science and hopeless at athletics. A friend of mine is the opposite, he's good at athletics and hopeless at maths and science. But we are both successful in life. It's not the characteristics of the group that's the problem, but the outcomes of the group. For example: If members of one group is incarcerated five times as often as the members of another, then there is a problem beyond the group and its characteristics. The same applies for health outcomes. (Assuming that the group isn't self selecting for health problems: Obviously a group of Down syndrome individuals would fair worse health wise than the average.) Also it seems clear that the health issues of different groups would most likely be different in nature (not in severity), but the overall health outcomes should be very similar for each group, unless there was some external bias.
There is sometimes difficulty separating outcomes and characteristics. I think the best example of this is generational racism. If a group has been deprived of good education for generations solely on the basis of their race (which has happened here in Australia), then this will show up in their characteristics. Poor knowledge and poor reasoning skills will show up as a characteristic. But it's not an intrinsic characteristic. It is one that has been foisted on them from outside their group, and therefore it is actually an external bias.
"systemic racism is the reason for all outcome differences"
I'd put it slightly differently:
"Systematic bias is one of the major reasons for significant outcome differences between different groups within any society"
We can work to help minimize overt and systemic bias. We can't work to create "equal outcomes of all groups" when all groups aren't equal (which doesn't mean superior or inferior, just different characteristics and/or preferences).
It's interesting that you start arguing from the aspect of characteristics and end up talking about outcomes. You do it seamlessly as though they are the same thing. They are not. Yes, different groups may have different characteristics, but the outcomes of each group should be similar. If they are not, then there is a clear reason (eg: my Down syndrome example) or there is some external bias occurring. In both cases we should address the problem; this is why we have affirmative action, anti discrimination laws, and accessibility regulations. .