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Why is the comparison necessary? My understanding is that insurance should be factoring in the expected value of accidents, which is an absolute measurement, not a relative one.

Isn't that still an indicator, albeit not a strong one, that Tesla-like autopilot features are safer?

Saying "Cars with ABS have lower crash rates than the same cars without" means that I'd prefer a car with ABS... I don't wanna spin out in the snow. I'd also enjoy and feel somewhat entitled to a lower insurance rate than a non-ABS car.

I don't think so. In fact, since they're comparing very similar pools of cars and drivers with the introduction of Autopilot being the major difference, I'd think that this is a more valid comparison than one which compares vastly different pools of cars and drivers.