There's a little stretching of the definition of autonomous, here, since Schmidt is directly in control of the car himself. The vehicle, however, does much of the heavy lifting for him, and so qualifies under Nevada state law as self-driving. For instance, Schmidt controls the gear shift through voice commands, that the car then handles automatically, while a sip-and-puff device enables him to control acceleration and braking. The vehicle's customization was handled by Arrow Electronics as part of its semi-autonomous motorcar project.
The granting of the license is a huge step forward in enabling disabled people to regain their independence, since Schmidt can now travel ostensibly where he wants. Nevada will also use it to burnish its credentials as a tech-friendly city, since it now houses plenty of bleeding-edge tech startups including Hyperloop One and Faraday Future -- not to mention that it's also the home of Tesla's Gigafactory. It's also a big deal for the world of semi-autonomous vehicles, since legislators may look more favorably upon cars with humans behind the wheel. After all, most of the alarmism that currently surrounds autopilot systems is that a computer can't make the sort of snap judgments a person can.