This is the exact wording. I'm pretty sure you're wrong to say this represents 110% rather than 10%. If 100 whites get pulled, 110 blacks get pulled. That's 1.1x the rate.

In fact this is wrong, too. Those numbers are surely per capita. But there's no way "1.1x the rate" means 110% more, it meas 110% in total, ie 10% more than 100%.