This country is so very freaked about mind-altering substances, vices, and "sins", that it doesn't get talked about much. But the truth is it's been known for over a century that drinkers have cleaner arteries. Thinner blood, and/or some chemistry with the alcohol seems to help keep the plaques from forming.
Very heavy and binge drinking does start to cause other problems - and these results are what people bandy about in order to bash alcohol as a deadly vice. But it's been clear for a long time that moderate drinking can avoid those problems while still resulting in cleaner arteries. And since heart disease is the single biggest killer in the first world, it should be no surprise at all that anything which can reduce atherosclerosis results in a noticeable decrease in the death rate.
Nothing about this study is news to anyone who's paid attention to the science, anytime in the last hundred years.