I don't think this is fair. From the original article:
> [...] the Affordable Care Act might result in millions of workers’ scaling back from full-time to part-time jobs.
The implication is that millions of workers would be voluntarily cutting back their hours, since they no longer need to be employed full-time to get health care -- not that these workers would be having their hours cut. It's people like Rand Paul and talk-show hosts who are complaining complaining that other people might start choosing to work less hours overall ("adding insult to injury").
If people who are currently fully employed choose to reduce their hours, that means more work is available for those who are interested in working more -- there's no conflict of interest here.