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They are grounded if you use the "power adapter extension cable" (not shipped with the unit): https://www.apple.com/ca/shop/product/MK122LL/A/power-adapte...
Why don't Apple offer grounded duckheads? For that matter, why haven't any third parties made grounded duckheads? This has been irritating me for the past decade or more. The ground connection, where available, occurs through the metal stud which the duckhead slides into. Correct me if I'm wrong, but even the UK (Type G) duckhead doesn't connect ground even though the physical ground pin is mandatory. I know that mos…
[1] https://www.amazon.com/Replacement-Adapter-Duckhead-Universa...