They're both from Tesla. There's no real proof that they're representative of safe driving. And you kind of want it to flow both ways: "the safety score represents good driving, so I get cheaper insurance" and "I get cheaper insurance so the safety score must represent good driving".

You're trying to use each of these things to validate the other so you can then claim it's something entirely else.

I think it's telling that autopilot is allowed to drive in a manner that would otherwise negatively impact your safety score. Either autopilot is unsafe or the safety score doesn't measure actual safe driving.