I don't know enough about FR vampire lore to know, but I thought his line about the wine being sour, which you can taste and have described as rich, was a result of vampires not being able to enjoy food. Is that a thing?
I wondered about that too. I know it's a thing in other vampire lore, but where does this game stand on it? I didn't understand the exchange about the wine at all because I don't drink wine and I couldn't tell if the narrator's description backed up Astarion or contradicted him.