Vampires aren't real in general, this is like saying that someone's reimagination of fictional creatures is somehow "less real" than yours, because it is not horror. Well, the horror genre didn't invent vamps. As fictional creatures they exist in different folklores, and with more variety. It is not always evil undead, that is just the trope Western authors like to repeat.
I know that vampires are not real. But even the vampires in folklore are as a rule more dangerous and dark than your typical Twilight vampire. And since Twilight, you seldom find anything else but those whiny wannabe vampires. ANd Astarion fits right into that.
"We are all stories in the end. Just make it a good one."
