Earlier quoted context omitted.
" It is impossible for 80% of Americans to receive something from their employer if 80% of Americans didn't even have an employer." Data aside, that is not a logically true claim: in 1980, I had health insurance... through my mother's employer.
Nhashem didn't say "through someone else's employer".
But yes, I suppose that on some level you're right: 80% of the population has probably never been simultaneously employed.