I think the article created a lot of the confusion. Having access to cleared people is important to companies primarily for winning lucrative government contracts. For example, if a 3 letter agency wants to implement a cloud service on an air-gapped intranet, or award a contract to implement social-media algorithms to suss out terrorist networks, they'll look to companies with that sort of expertise. But if those companies don't have a corps of cleared employees, they're out of the running. Having said that, having trustworthy employees (which a clearance implies, but does not guarantee) might be valuable to companies not dealing with classified information, but the article left out the real reason that companies are heavily invested in recruiting people with clearances.