Okay, so the problem there is that it isn't an apples to apples comparison. The 'miles driven while using autopilot' basically only contain very nice driving conditions, either slow moving congestion, wide open roads, no miles with snow surely, no lane changing, etc. But the 'miles driven without autopilot' contain all those things, quick lane changes and snow and rain and city driving and parking lot driving, basically all the scenarios where accidents are very likely. It's pure selection bias, it says nothing about the state of Autopilot and Musk likes it that way.