No, the issue is simply that the alcohol intake he describes should not have that big of an impact.

A few pints of beer or some wine with dinner should not completely wreck the day after, unless there is some medical condition that is worsening the effect.

Personally, I don't care of people drink or not, that's their choice. What I'm saying is that his intake was probably heavier than he claims, which would certainly account for his marked improvement in health when he cut out alcohol completely.