Well, you put the shoe on the other foot.
What evidence can you provide that China has the capability pf protecting the Pearl River heartland? of Shanghai? of vital ports?
There are several videos discussing the vulnerability of the dam. Apparently The means exist. The current news is that Chinese air defense systems failed to engage the recent successful air attacks on Venezuela.
No evidence.
My belief is that it will take a substantial effort to take out the damn to the point that it fails.
WSJ had an article that mentioned Jane’s Defence saying that Venezuela had older Chinese systems.