https://www.boston.com/news/local-news/2025/02/10/boston-man-found-not-guilty-of-being-a-chinese-agent/ that's the first "Chinese spy" in that Hill article
During COVID China let people do government paperwork in an app instead of the embassy, and let local businesses sign up to help old or poor people with the app. The FBI decided to call that "police stations" and went after guys who owned a restaurant and set up an iPad for people to use and scared the shit out of them. They hadn't done anything yet, but if the FBI scared them enough to lie or delete the app, now there's a process crime and they're fucked. There was nothing actually happening, like all the teenage autistic terrorists the FBI makes up and pretends to catch. Same with the other countries the panic spread to:
They put a plug in the bottom that melts if the salt gets too hot and it drains out into a tank that stops the reaction with no moving parts or anyone controlling it. After it cools down they can remelt it and put it back in.