Moderation may work for a problem drinker but for an alcoholic in my experience moderation is out of equation. The book later differentiates between a moderate drinker vs a hard drinker vs a real alcoholic.
Here is the differentiation:
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Moderate drinkers have little trouble in giving up liquor entirely if they have good reason for it. They can take it or leave it alone.
Then we have a certain type of hard drinker. He may have the habit badly enough to gradually impair him physically and mentally. It may cause him to die a few years before his time. If a sufficiently strong reason ill health, falling in love, change of environment, or the warning of a doctor becomes operative, this man can also stop or moderate, although he may find it difficult and troublesome and may even need medical attention.
But what about the real alcoholic? He may start off as a moderate drinker; he may or may not become a continuous hard drinker; but at some stage of his drinking career he begins to lose all control of his liquor consumption, once he starts to drink.
Here is a fellow who has been puzzling you, especially in his lack of control. He does absurd, incredible, tragic things while drinking. He is a real Dr. Jekyll and Mr. Hyde. He is seldom mildly intoxicated. He is always more or less insanely drunk. His disposition while drinking resembles his normal nature but little. He may be one of the finest fellows in the world. Yet let him drink for a day, and he frequently becomes disgustingly, and even dangerously anti-social. He has a positive genius for getting tight at exactly the wrong moment, particularly when some important decision must be made or engagement kept. He is often perfectly sensible and well balanced concerning everything except liquor, but in that respect he is incredibly dishonest and selfish. He often possesses special abilities, skills, and aptitudes, and has a promising career ahead of him. He uses his gifts to build up a bright outlook for his family and himself, and then pulls the structure down on his head by a senseless series of sprees. He is the fellow who goes to bed so intoxicated he ought to sleep the clock around. Yet early next morning he searches madly for the bottle he misplace the night before. If he can afford it, he may have liquor concealed all over his house to be certain no one gets his entire supply away from him to throw down the wastepipe. As matters grow worse, he begins to use a combination of high-powered sedative and liquor to quiet his nerves so he can go to work. Then comes the day when he simply cannot make it and gets drunk all over again. Perhaps he goes to a doctor who gives him morphine or some sedative with which to taper off. Then he begins to appear at hospitals and sanitariums.
This is by no means a comprehensive picture of the true alcoholic, as our behavior patterns vary. But this description should identify him roughly.
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Some where in my drinking career, I could relate to that 'crossing the invisible line' but it was too late. Alcoholism has crept deep into my being. Every attempt to stop/moderate was followed by worse than earlier condition. It was just not the blackouts and other external conditions but internally I was devastated, filled with fear, rage, unable to have a decent conversation with anyone.