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Thank you for contradicting your own pearls of wisdom, right in your own reply. It just goes to show that you Codebots (who haven't a *SOLITARY CLUE* about common sense) are destined to drown in your own anal-retentive hand wringing.
There is a 100% solid ground connection when you have BX in a metalic connector of a metalic box and you have a receptacle in that box where the ears are mechanically attached to the ground screw. To aregue any different is to admit that you defy the truth sitting in front of your face. Keep it up, the rest of us will accept the *FACT* of what we see with our own eyes.
Meanwhile, anybody who speaks of "impedence" while talking of a 60 Hz circuit is a bigger fool than you were the day you were born. HINT: "Impedence" means *NOTHING* at sub-RF frequencies. For *ALL* intents and purposes, the "impedence" of a 60 Hz AC circuit is identical to the resistance. Nice try at attempting to muddy the waters with meaningless information, moron.