Interesting article, and always a good reminder. Generally so far, the spoofs are been relatively short range, and low power. But there is always a possible satellite attack, which has not been demonstrated thus far. Many of the new GPS units use the Russian GLONASS as well as US based GPS..European Galileo, and Chinese BeiDou/Compass are also semi-functional, as well as several other systems using different technology.
There is reasonable that alternate systems, using WiFi, G5, and cellular technology will be dominate for autonomous vehicles, to avoid issues with GPS.