Of course not, I'm sure China will land a blow here and there among assets of American, Japanese, Taiwanese maybe Australian origin, who knows? As you say, a hypothetical, merely thrown out into the tally of China's venerable spots in the (hopefully) unlikely event they are foolish enough to try and fight dirty and take the war beyond the scope of being Taiwan's would-be conqueror.
If that damn, and I guess some of the ones, on the Jinsha especially, lost one of it's main stages the cascading blender of death that cascaded down and over other dams would be catastrophic. The death toll within first 24hours would likely be in the tens to hundreds of millions. They have so many dams and communities stacked so close together, which along with China's awesome history on industrial regulation means the resulting washout and stagnant aftermath would probably be one of histories worst/costliest attacks in the history of organized warfare. The drain on resources and loss of production would both be enormous, to say nothing of the death toll, which yes, unfortunately would be largely civilian. All the factories, the open mines, the landfills, the bodies mixed in with it all...
Like I said, dirty. And without splitting any atoms mind you.
May things never get that desperate.