The first question is why did the tiles come loose? If installed correctly tiles should not come loose.

First of all if it was installed correctly you wouldn’t have a problem. To fully figure it out I would have to perform a forensic intrusive inspection, which probably isn’t practical for a small shower.

Hollow sounding tile is not a defect per industry standards.

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Patching the grout joints to stop the leak is a band aide approach. It does not fix the problem, rather it is only fixing the symptom of the problem.

First of all a hollow sounding marble floor is not considered a defect in itself. It could be a symptom of a defect.

I’m assuming the hollow area under the tile is a void.

I’m guessing that the terrazzo floor is the cementitious type and not the epoxy type, but either way, f the terrazzo floor was originally installed correctly, it should not have been harmed by the flood.

If the subfloor and tile was replaced as specified, then the new tile floor should not have been any higher.

Normally we don’t have problems finding natural stone to match existing installations for repairs.