Critical reading isn't your strong suit.  From your link, "Researchers found state-by-state variations in the insurance offers. For instance, Hawaii had the largest proportion of workers in jobs with employer-sponsored coverage, at 97 percent. Montana had the lowest rate with 66 percent."

A very high percentage of people in the US economy are self-employed or independent contractors.  Realtors, Insurance salesmen and other straight commission sales people, mortgage brokers, small shops in strip malls, etc.  And many of them have spouses who work for employers who provide group health insurance.  In my case, I work on straight commission, and I'm covered by both the VA and Medicare.  Do the statistics include me in the individual market?  How do they know?

I read recently that over 90% of the people with pre-existing conditions are already covered by either employer-sponsored group plans (often through spouses), or government plans.  The vulnerable are a relatively small number.