While I disagree with the authors premise that you should never use a cable lock, understand how they can be defeated and use appropriately. With the exception of alarms, the bicycle community has debated the lock issue ad nauseam. The conclusion being to use a quality U-lock and secure it properly. Supplementing with a chain or cable adds further protection. In the end, insurance is your only real protection against the motivated professional.
A cable lock that gets used is far more valuable than the big, heavy, hardened steel chain that gets left at home. Each layer of protection adds to the amount of time it will take a thief, which is what deters them. Unfortunately, each layer of protection also adds to your level of inconvenience as well as cost.