This report is for employer health costs only
This report covers employer health costs only. In other words, the only people seeing these particular health care increases are people employed by these companies, and presumably better able to pay for their health insurance. If the average employee at these companies couldn't afford the premiums and co-pays, these companies would have a revolt on their hands. There would be no point in offering these plans in the first place since they wouldn't attract employees.
If you can't afford to pay for health care, you still get free health care at ERs. If you are on Medicare and Medicaid, your costs are still covered. In fact, one of the reasons employer-sponsored health care has gone up is because doctors and hospitals shift costs from these sources to employers.