[HPsauce]

Whilst not wishing to "rain on anyones parade" I do believe that the assumptions behind that repair process are incorrect.
If it did fix the problem it's probably purely coincidental and more likely to be down to the "reset" process described at the end, or just possibly by clearing a physical obstruction.

I am 100% convinced that the ONLY function of those metal contacts (and the plastic arc on the glass) is to stabilise the mirror, possibly reducing vibration.
As such they need to be clean and smooth and grip the plastic arc but not too tightly.

This is because in the last few days, as part of trying to fix a "folding" issue I have swapped and reswapped and tested thoroughly 2 different passenger mirror units on my S8.
Both have memory, support heated glass and do the "reverse dip"; the only issue is innacurate folding/unfolding (on both ).

So why do I think this?
Well the memory works fine, as does the reverse dip. With a little gentle "manual assistance" so does fold/unfold. On BOTH units.
Yet one doesn't even have the metal clips installed!

Furthermore the metal clips aren't connected to anything and are in fact ONE SINGLE PIECE OF BENT METAL held in place by a metal screw into the metal frame, so effectively earthed.
What's more swapping it between units made no difference to anything, both worked equally well with or without the clips.

So, that's my conclusion, hopefully it will help people consider the symptoms of their problems and not get confused when a published procedure doesn't actually fix the problem

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Edit: I note that the mirror glass in the pictures above also has auto-dim which mine does not, although the wiring for it is present in the units (but not elsewhere in the car) - the plug is actually tucked away beside the fold motor in mine.