What kind of grout cannot get wet?!

Sent someone who shall not be named to the hardware store for sanded grout. He came home with a tub of this combo product that is adhesive AND grout. I am skeptical.

Reading the label, I see that this “is not to be used for a shower”. It’s not for a shower, but it IS for an application where we can expect it to get wet. In my mind, that’s kind of what grout is for. Places where things get wet.

So I have to ask. Pardon my shouting. WHAT KIND OF GROUT CANNOT GET WET?! I cannot imagine any tile application: floor, wall, anywhere: that sooner or later will not get washed, at least.

Is this a thing now? Grout that has to stay dry? I am mystified. Please explain this to me.

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