Thank you for sharing this research. As someone who abstains from drinking and is very health-conscious, I've been conflicted about all the research supposedly showing health benefits of moderate drinking. The evidence just seemed too intuitive. This gives me something to explore.
Latest meta-analyses say that after controlling for reasons behind non-drinkers (‘former alcoholics’) the effect disappears.
Good starting point is https://www.ncbi.nlm.nih.gov/m/pubmed/26997174/