Good question.
There's a big difference between, "These are the observed results" and "These people are inherently X". And especially different than, "Person is Y, therefore they are good/bad at X".
The first statement is open ended, it keeps the door open to systemic factors outside of race that might correlate with race. It also doesn't suggest that everyone of a particular group is better/worse at something.
The second statement says that there's something intrinsic to that everyone of that race. It sets up expectations for a group of people. Maybe you are an Asian who isn't good at math? How does that make you feel? How will you be impacted by other people making assumptions about you?
The third statement is applying stereotypes to individuals, which is just never going to be a good idea.
The differences between the first and second statements are subtle, but important.