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You don't need to "metabolize useful energy out of concrete, sand, glass, and dirt" to have a nightmare scenario...

Anything that can metabolize lots of kinds of multicellular living matter could can do insane amounts of damage even if it's not a pathogen... for example agriculture is quite frail and we depend on it!

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That's not really grey goo, in the typical use of the term; that's just a novel agricultural pest.

a hypothetical global catastrophic scenario involving molecular nanotechnology in which out-of-control self-replicating machines consume all biomass on Earth while building more of themselves

It’s right there in the first sentence. Nothing about eating concrete or sand.

Can’t create atoms out of thin air, maybe you can but that isn’t enough to replicate rapidly

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