The employer mandate in obamacare forces small companies to keep their workers under 30 hours a week. Remember, obamacare said that if you’re an employer and you work someone over 30 hours you have to give them full benefits i.e. healthcare coverage. As a result a lot of people in the service industry, waiters and restaurant workers, were cut to 30 or less. If the mandate went away, then workers could get more hours and have higher wages.
I understand you point with hours and how repeal of the employer mandate might lead to more hours worked. But I still don't understand how it would lead to higher wages for those hours. If the employer doesn't have to pay for health care then it's a nice addition to their bottom line. It doesn't mean that it will be automatically passed on to the worker. Or even likely to be passed on to the worker.