Read the actual report. The Uber system registered that emergency braking was necessary to avoid a collision but the brakes were not under the control of that system.

https://www.ntsb.gov/investigations/AccidentReports/Pages/HW...

Relevant section: "At 1.3 seconds before impact, the self-driving system determined that an emergency braking maneuver was needed to mitigate a collision (see figure 2).[2] According to Uber, emergency braking maneuvers are not enabled while the vehicle is under computer control, to reduce the potential for erratic vehicle behavior. The vehicle operator is relied on to intervene and take action. "