He means that the law firm makes money by billing hours; hence if you take less time to do a task, the firm earns less money.

Although in theory they could just up their hourly rate, if their hours are more productive, now.

Yeah, I'm the author and I know what billable hours are. My hours here weren't being billed out to the client.

Surely people aren't paying a lawyers hourly rate for them to cut and paste around spreadsheets?