Earlier quoted context omitted.
Except their technology was ON the car that was involved... they are part of the story - Uber turned their gear off in favor of their own.
The whole point is that uber is developing their own gear. Dunno about you, but for me giving two self-driving systems control over the car at same time seems like a recipe for disaster. Of course they turned off the other systems.
When I drive a car, I am a 'self-driving system'. It is intended that I am used in conjunction with the car's existing driving-assist functionality.