This oil is a complete marketing ploy. Porsche has no refinery that I know of, and to add to that 10w is too thin for any old car. The amount of research that Porsche engineers did to this oil is probably 0% - with the
PR department and marketing making up the other 100%. I don't know what it costs, but I am sure it's several dollars more than any off-the-shelf VR1 or other.
Glad it works for you. Who knows, your engine may like it better for all we know.