Yeah from my brief reading it seems they can adapt to food salinity by altering their urine concentrations so I don’t think that’s a huge factor, at least it’s not something that comes into play before the other factors begin to harm them. But if you could fix their skin and buoyancy, diet may start to matter. But their prey is also a different salinity than the water it lives in a lot of the time, and sometimes they eat land animals like birds and such ofc.
Atoms in a stable state are very strong and it would take incredible amounts of energy to pull them apart