I find the title delightfully vague and open to interpretation. Does the title imply that prior to the sixth generation, the fifth generation and earlier generations cannot have fully autonomous operations? Or does the title merely suggest that an earlier version of sixth generation was not ready for fully autonomous operations but now is?

The latter.

They appear to be distinguished externally by the vehicle model and new sensor design. Currently, the production fleet in Phoenix and elsewhere consists of the Jaguar I-PACE.

The sixth generation would have been in testing phases -- closed tracks, simulations, and supervised driving. Now they're deploying on the Waymo Ojai (Zeekr) and Hyundai's IONIQ 5.

This is way more fun than I ever had in my Corolla.

From the company who got the world "go-goo"ing like infants, I, for one, can't wait to say "O HAI" to my new ride, or "Isn't it IONIQ, don't you think?"

I know it’s the latter. I was just critiquing the writing style.