These quotes from the above article are quite telling:
"Copilot is still a long way off matching even an average human driver, however. The highway-only system has not been trained to drive on city streets, where pedestrians, cyclists, narrow roads and oncoming traffic make driving exponentially more difficult."
"Completing the transcontinental voyage also took multiple attempts. The first try, in late September, ended on the Bonneville Salt Flats in Utah, when the system disengaged on a banked curve in high winds. On its second go, two weeks later, Levandowski says the Copilot worked perfectly for 650 miles, again as far as Utah. But it was too perfect for one Nevada highway patrol officer, who pulled the Prius over after noticing it driving slightly below the speed limit in an area where most drivers were speeding.
“The team tried to tell me that it wasn’t a disengagement, but I said, I can’t touch the steering wheel, brake or gas otherwise everybody’s going to look for the gotcha. So we came back to San Francisco,” recalls Levandowski.
Pronto engineers adjusted the software so that the car would be allowed to travel faster on certain roads, and tried again. On his third trip, Levandowski said that he encountered rain in Nebraska and Illinois, high winds in Wyoming, and a rolled-over semi in Pennsylvania, but eventually made it to the George Washington Bridge without a disengagement."
Copilot is not true self-driving by any stretch of the imagination. The idea that it is "way ahead of Tesla" is laughable.
Basically, he just developed his own version of autopilot which after some failed attempts and tweaks, was finally able to go a really long way on highways without driver input. Nice but not some amazing self-driving feat.
Tesla is aiming for true and reliable full self-driving, where the car can actually self-drive on highways and city streets without driver input. It will take longer to accomplish for sure but it will also be more meaningful that this little stunt.