Sorry. This is laughable. Just medical science trying to justify its existence by putting more details on paper and attempting to qualify it as a breakthrough for so-called ‘treatment’ (read $$).
Addiction is, unfortunately, an assured result of excesses pursuant to basic biochemical survival mechanisms built into our biology. Cortisol is an effect having no relation whatsoever to the biochemical process which prompts addictive behavior.
Until there’s a major breakthrough in brain chemistry (possibly gene therapy, perhaps even psychological) addiction treatment will remain much like it is:
Largely ineffective.
Cortisol is merely a way to understand how much stress an alcoholic is still under at a given point in time while in therapy. That cortisol equates to a likely desire for alcohol, for someone who uses alcohol to treat stress, if otherwise in good care.
I think you misinterpreted the writeup.