Cement in concrete cures -- chemically reacts -- with water. If it dries out, the curing stops permanently. That is a fact.
But, I have no way to know if that happened to your gunite (a form of cement-based concrete) or not. Hopefully not, but I doubt you can do anything until something goes wrong.
What I would do is document the heck out of your exchanges and assurances, and the time line of events. Get people to sign off on statements of "this is what happened" so that if you do -- God forbid -- have to exercise your warranty, they won't be able wriggle out of it.
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