I think nobody would argue drinking a lot of alcohol, or substantial alcohol, is detrimental for health.
The question being argued is whether drinking a small amount of alcohol is detrimental to your health. This is a different matter altogether.
We, humans, have been drinking alcohol for millenia. I'm skeptical to the idea that a small amount, say, a glass of wine for lunch every day or so, can harm us, especially for active individuals. There has been a natural selection process for us to adapt.
I believe what Taleb is doing here is of great public value, and I commend him for that.
There is no evidence either small quantities of tobacco or most drugs harm you either.
People that want to drink will find excuses to do so.
I spent some time working with CBT for alcohol use disorder, mainly treating "active individuals". I've heard your line of reasoning many times. No level of alcohol consumption is considered risk free from a scientific point of view, at least the view of the senior researchers and professors I worked quite closely with.
So, I don't think this is providing "great public value", on the contrary I would suggest spending time with the research and treatment of the many individuals starting out thinking that "a glass of wine for lunch every day or so" can't "harm us".