The speaker makes it sound incredible. However, I believe this state of mind is more common than he realizes. The euphoria that he is explaining is very powerful. The ability to continue to operate and stay involved in everyday life while being heavily intoxicated is even more amazing.
Because the intoxicated person can continue to perform daily tasks, they are not aware how much the poison of alcohol is affecting various areas of their body.
The strength of the mind to continue to function in an intoxicated state is what is allowing the organs of the body to slowly rot inside.
By the time physical damages are noticed in a functioning alcoholic they are normally too far gone to be reversed.