I read the whole blog post, but not sure what's the difference between this car and the Tesla with 2.5 Autopilot hardware. Isn't that a production ready car tha

I read the whole blog post, but not sure what's the difference between this car and the Tesla with 2.5 Autopilot hardware. Isn't that a production ready car that will give you autonomous L4/L5 "some day" ? Or is there some fundamental difference that I am missing out on ?