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Interestingly, that cable seems to use a 3-conductor (TRS) 3.5mm connector as opposed the usual 4-conductor one found on EarBuds. So I guess that implies it doesn't carry mic input?

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It's an unusual cable in that it's bidirectional, but it's not full duplex. So there's no mic input, but you can use it for both audio input and output (e.g., plane audio jack to headphones OR iPhone to vintage car head unit).

I strongly suspect a lightning-to-lightning connection (e.g., headphones to iPhone) would be full duplex though.

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