My dad drank heavily when he was in the army. He fought in the front lines of two wars. I think he did it at least in part so he could sleep because alcohol helps suppress dreams (and, thus, also nightmares). About four years after he left the army, he swore off alcohol and basically never touched it again.
I loathe the taste of alcohol and, for most of my life, rarely have touched the stuff. But I did have a nightcap almost every night for a year at a time when I was very ill and doctors didn't really know what to do for me. At some point in there, it was not unusual for me to have two doubles with dinner -- the equivalent to four drinks. So I imagine I could have been classified as an alcoholic at that time. But when I got some answers and started getting healthier, I was happy to stop drinking. Like my father, I never attended AA, never wrestled with trying to resist temptation or whatever, etc.
In my father's case, I think it helped with psychological trauma. In my case, it helped me survive illness at a time when I didn't have good answers and wasn't getting adequate medical treatment. I have read or heard plenty of other stories that look to me like they fit one of those categories.
So I think the article oversimplifies things in suggesting it is just a developmental disorder, but I am thrilled to see a piece talking about the reality that most folks drink less as they get older, without getting any treatment. I really, really dislike the AA model.