Lol what a joke. It would take a Chinese SSN about a month just to make the transit. By the time they reached the op area it would be almost time to turn around and go home.
Regardless of legal issues and whether it would be stupid or not, China still lacks an effective blue water navy capable of projecting sustained power in the Caribbean Sea. They just can't do it in any meaningful way. They're expanding fast and might be able to do it in a few years but not today.
Nah. Chinese submarines aren't that quiet so if there were any in the area then the US Navy would have them localized already and there's no sign of that. And Chinese subs lack the persistence to stick around without support for long. The reality is there are zero Chinese subs anywhere near Venezuela.