They were connected to the internet. Did we all forget about the GA senate hearing where Jovan Pulitzer hacked into the Dominion servers live? This happened.

The only way we are going to know if China was connected is if they pull flow logs from the network and see who hit what from where. But that is only possible if the logs exist, or this traffic was captured in some capacity.

There is scores of evidence that fraud happened, and this is the surface level stuff. Who knows what the white hats have.