I know of an R44 which landed in knee deep water in the Kimberley’s during a flood evacuation years ago & that’s where it stayed as the engine sucked water up through the air cleaner. Once it was back on dry ground it was found that the seal around the filter wasn’t quite up to scratch. Looking at those photos of the machine sitting in the water I’d be worried about getting back off the water again, which makes the floats a single use item in my books!