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Mahle's QC issues aside, an air gage is more accurate and repeatable than a handheld bore gage. By not contacting the workpiece the distortion of the surface that occurs even with the lightest contact pressure cannot occur. It doesn't seem like a lot but when you start measuring in millionths a lot of new variables come into play.
It does make you wonder why oval cylinders are making it through, however. You would think that they would be checked for ovality at many stages of the manufacturing process and the rejects would be fixed or junked before they left. Do you think it is as a result of the fact that the quantities produced are too small to justify more rigorous QC?
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