The main outcome of the study was that couples that participated in ANY treatment had similar outcomes. The benefit was compared to a "No treatment" group.
But the article fails to mention that this "no treatment" group was not randomly selected!! The "no treatment" group was made up of couples that refused treatment, or failed to participate in treatments because of scheduling constraints.
So a less misleading headline might be: Couples that refuse relationship counselling have higher divorce rates. But that would surprise noone.