Keep in mind that almost no organization (outside alcohol sellers) can "recommend" alcohol consumption for the simple reason that alcohol is extremely negative for certain cohorts (i.e., alcoholics). Therefore, even if there are demonstrated benefits for the majority of the healthy population, no one wants to be seen as supporting the harms, which, in fairness, are often extremely bad. That said, even your quoted text admits that there may be potential health benefits to alcohol consumption in moderation.