Are US Computer Networks A 'Key Battlefield' in any Future Conflict with China?

In a potential U.S.-China conflict, cyberattackers are military weapons. That's the thrust of a new article from the Wall Street Journal:
The message from President Biden's national security adviser was startling. Chinese hackers had gained the ability to shut down dozens of U.S. ports, power grids and other infrastructure targets at will, Jake Sullivan told telecommunications and technology executives at a secret meeting at the White House in the fall of 2023, according to people familiar with