That gives you absolute rate, but not relative rate.

There are not many other cars out there (in comparison), with a self-driving mode. There are so many Teslas in the World out there driving around, that I think you'd have to considerably multiply all the others combined to get close to that number.

As such, while 5 > 0, and that's a problem, what we don't know (and perhaps can't know), is how that adjusts for population size. I'd want to see a motorcycle fatality rate per auto-driver-mile number, and even then, I'd want it adjusting for prevalence of motorcycles in the local population: the number in India, Rome, London and South California vary quite a bit.