My guess would be that this is an off-the-shelf dashcam, completely independent from the self-driving cameras and sensors. Being an off-the-shelf dashcam means

My guess would be that this is an off-the-shelf dashcam, completely independent from the self-driving cameras and sensors. Being an off-the-shelf dashcam means extracting and publishing the video from it is easy, which is why it came out first. It also explains why it has video from inside the car; many off-the-shelf dashcam models have both a forward-facing and a backwards-facing camera. Personally, I'm more annoyed at the blurring of the telemetry data at the bottom of the video. What was blurred probably included the dashcam model, date/time, GPS coordinates, calculated speed, and so on. The output from the other sensors might take more work to extract and convert into an understandable form, if they are even available after the fact; they might be immediately used in the control loop and then discarded, instead of being stored.