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On that diagram the brown earth return from the horn contact goes through the airbag slip ring if you look at the little tag wire off of it there is a box with a number in it (I cant read it too pixelated but looks like M110) that probably refers to another diagram for non airbag type or an image of an earth location
Edit just found this image, some Porsches have a link wire from rack to subframe where they have rubber mounted racks, worth a look, just run a jump lead from the rack to earth and see if you get what you need.
Fixedwheelnut
Hefty
I don't think they do, the technique used in that article you found indicates that the column on a 993 is a ground, which is not what we've found with the 996.
Here's the diagram, top left corner is the relevant bit - you can see that the horn and airbag connect via the clockspring.
Which is how the 993 does it, also, however the key difference would appear to be that the upper column on the 996 is isolated whereas the 993 is not. I imagine this is because the 993 column is non-adjustable whereas the 996 is reach-adjustable.
Unless the auto-electrician has made an error, and the slip-ring inside the column which the indicator cancellation tab meets on the 993 is available for the same use in the 996.
I can't establish that at this point, but have emailed the electrician and asked the question.