How would this person survive only a few years ago if they blindly trusted Google Maps completely and absolutely for their physical safety? Google Maps doesn't turn your steering wheel or press your gas pedal.
I would usually agree but there was no barriers I am not sure about signage. While I think the driver should always be aware of where they are driving they honestly set him up for failure. On top of that Google had a decade to fix the route and didn't.
If there was signage, that at a minimum would make it his fault.