You mean there is no contribution to health at all? No improvement in bone mass, memory, digestion, diabetes, HDL cholesterol, longevity, reduction in the risk of heart disease, cancer? No benefit from antioxidants, resveratrol, or flavonoids? Hippocraties, Ramban, Talmud were all entirely mistaken?
I am fairly confident we can find a “study” to support almost any position.
If science has taught us anything, it is that our understanding will be different tomorrow than it is today.
Karl Popper said: "Science does not seek the truth but only the best generalization of that which is known to date. Such generalizations alter and disprove one another. This is the nature of science." Newton, Einstein, Hawking’ were all great contributors to the body if knowledge but they were also (in part) mistaken. Quantum science has shattered Newtonian determinism. Einstein admitted “vacuum energy” or “cosmological constant” was “the biggest blunder of his professional career” a numerical value required to preserve a static universe, and almost no one buys Stephen Hawkins’s “oscillating universe” any more. This will not stop the postulation of new theories or new studies. The present, inconvenient and scientific truth for many is there was indeed, a beginning! How many planets are there? The world is no longer flat, and if we are certain it will always be understood as round, perhaps we are buying into the limiting assumption that we will not have new insights in the future that will shatter our understanding today.
I have seen some contrary conclusions also but I think there is a significant body of evidence from Chazal to and including continuing research that Kosher wine is good for you body and soul.
Further, I think the research and discussion should continue over a bottle of fine Kosher wine.