Reseveratrol is really over hyped to begin with. It is nothing more than a phytoestrogen. You can get phytoestrogens from all sorts of foods.
And red wine actually contains very little resveratrol. You would have to drink 40,000 glasses of wine to get any benefit. So unless that red wine concentrate is concentrated at 1000:1 concentrate you are not going to get any benefit. If it were concentrated that strong it would cost a lot more than $90 a bottle. So the whole thing is a scam over all that is just capitalizing on the recent news reports on resveratrol.
By the way, commercial resveratrol comes from Japanese knotweed, not red wine.