Is there watermarking on the back of the carpet? Ditto underlay? Ditto floorboards? Has dye run on gripperods? I doubt this very much.
I once attended, with a Bsc qualified industrial chemist/carpet inspector, a similar claim from a custard who was trying it on. His surveyor friend had taken measurements with his moisture meter, which my friend than did some calculations from. The cleaner would have had to have left the carpet under about 2" of water to create those readings!!
I would suggest, without any knowledge of your own particular case, that the warped floorboards occured from some other cause. After all, how many of us have attended flood situations and still not had warped floorboards?
Safe and happy cleaning

Ken
PS Please do take this situation seriously though. Be totally professional at all times. Are you an NCCA member? Are you insured? These are two sources of advice.