For years we have been advised that a glass or two of wine is good for us and then this pops up. The basic message is: some European wines have such extraordinarily levels of heavy metals that even a single glass could be bad for our health.
There is an important nutritional lesson here and it is this: we're ignorant. For all the research that goes on we are a very long way of knowing what exactly constitutes good living. The research must proceed but please be very careful with health reporting. It is so very difficult to draw conclusions from a group of studies let alone a single study. Whatever you do with regard to your health always stick to the essentials. Experiment with diet and supplements, where possible do this in the context of regular blood tests so as to determine the effects. Remember, studies are statistical, the results of a particular study may be completely you irrelevant for someone living your life and with your physiology.
At the end of the day, all of us have to find out what works for us healthwise.