A couple additional pieces to keep in mind. Insurance companies are essentially capped at how much profit they can make on average per subscriber. For large groups 85% of every dollar collected has to be spent on medical expenses, and for small group / individual 80% has to be spent on medical expenses. If they don't meet those standards, the companies need to refund the premium to make up the difference.

In the linked article most of their profit would be coming from the large group market. The individual exchange is a separate segment and where they would be suffering those loses. So the desire to not remain in an unprofitable segment is not really negated by being profitable in a completely different segment.