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Fixer mentioned in the same post that the GND pin is not implemented, not sure how reliable that piece of info is though. Though from all the parts break down Sony displays for the WM1 it does look like they only connected two dual-braided (so 4 wires total) Kimber for the 4.4mm jacks on the 1Z, so I'm guessing the GND is not wired too.
Confirmed with Sony that in the 1Z, the earth isn't used or wired to anything (incl chassis). The TA-ZH1ES desktop amp though does leverage/wire the ground connector.