The [lack of health benefits] claim is based on the fact that most of the risk reductions in the latter two tables are not statistically significant, except for women aged 65 and over. But there is a simple reason for this which some cynical people would call a trick. A relatively small sample has been taken and then split into different age groups, sexes and consumption levels to create dozens of even smaller samples. This, combined with the fact that there are relatively few never-drinkers to use as a reference, makes it very difficult to generate statistically significant results from any individual group.
If you combined the age groups, the reduction in mortality would reach significance. If you combined the genders, it would reach significance. If you combined the various different drinking levels and simply compared those who drank moderately with those who never drank, it would reach significance.