A Panamera will have different sized tyres front and rear, and there will be a big variation in wheel and tyres sizes. I guess this guy is on something like 21-inch wheels with 35 or 30 profile tyres and they might have been a dealer fit without re-aligning and re-setting the steering angle sensor.

He needs a proper pitted laser alignment, and if there aren't any in the area, at the very leas an alignment on Hunter equipment by a branch of www.alignmycar.co.uk