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Google Home mini certainly has it, it's the only physical switch on the device.

IIRC My Mini has corrected me for speaking to it while it was muted so I'm not sure it's a hardware kill switch.

On my regular Google Home, pressing the mute switch makes it turn orange. It then won't respond to any voice input until you unmute it.

There's a huge difference in the microphone being physically incapable of hearing you vs a toggle switch that tells the os not to respond to you.

A physical switch does not necessarily mean the microphone is disconnected at the hardware-level. I checked these and I don't think it does