I think that if someone works enough hours to be full-time (although, Google says 30 hrs/wk, which is less than full-time) the ACA requires the employer to provide some kind of health insurance option or assistance to the employee. So the post is saying employers have multiple part time employees instead of full time employees so they don't have to pay for employee health insurance. I.e., the employer is shitty and unethical, or "smart" as it's considered in Trump's America.