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If you can, I would suggest that you clean up what you see and determine if it's an active leak, or if it's from some spills during the service. That way you can determine what the nature is of that oil; I don't have a full picture but things don't look bad, at all, on the ground under the car.
That said, I always worry about this kind of thing during a gasket change because, sometimes, things don't get seated quite right, or the gasket is not quite to spec, or the tolerances between your particular PDK unit and pan, and the gasket just don't quite mesh for a good seal. If you can document that you have an active leak that only manifested after the service, I imagine that the shop would make things right for you.