I'd question what he considered alcoholics, what people how they were identified.
And what type(s?) of control groups, drinkers whose views were spot on, nondrinkers with non spot on views. Did the views change when addiction was self identified by the participants, after recovery had views changed.
What the 'right' view is, what view of the world is shared and to what degree among people who became addicted because they loved getting drunk, those kinds of questions before I'd even consider his answers.