Oh, that might have been plain old incompetence rather than deliberate evidence tampering if both sides agreed to the bits that incriminate their own side. Unless there was something more going on that the logs would have shown, like “damage detected while self-driving enabled, dispatching Tesla cleanup crew to take care of the witnesses”.

Curious: what was the outcome of them being caught doing that?

Seems like a pretty risky lie as the car should have logs saying exactly what happened (at least to the level of detail of cruise control + accelerator vs self-driving).