Does "delivers twice the value to a company" mean "cost a company twice"?

Context:

At some point in our careers, most of us have come across someone known as a “toxic worker,” a colleague or boss whose abrasive style or devious actions can make the workday utterly miserable. Such people hurt morale, stoke conflict in the office, and harm a company’s reputation.

But toxic workers aren’t just annoying or unpleasant to be around; they cost firms significantly more money than most of them even realize. According to a new Harvard Business School (HBS) paper, toxic workers are so damaging to the bottom line that avoiding them or rooting them out delivers twice the value to a company that hiring a superstar performer does.

While a top 1 percent worker might return $5,303 in cost savings to a company through increased output, avoiding a toxic hire will net an estimated $12,489, the study said. That figure does not include savings from sidestepping litigation, regulatory penalties, or decreased productivity as a result of low morale.