This is the first known fatality in just over 130 million miles where Autopilot was activated. Among all vehicles in the US, there is a fatality every 94 million miles. Worldwide, there is a fatality approximately every 60 million miles.
The wording implies that these numbers are directly comparable, but they are not. I would guess that Autopilot is much more likely to be activated in safe situations. But the other statistics include all situtations.