Reading this on XDA that the Pixel phones will provide the below image if it detects any changes to the system partition:
Source: Pixel Phones Not Yet Rootable with Current Methods
I think it's safe to begin to believe that the Pixel line of devices has nothing whatsoever to do with the Nexus line.
Source: Pixel Phones Not Yet Rootable with Current Methods
I think it's safe to begin to believe that the Pixel line of devices has nothing whatsoever to do with the Nexus line.