There's a section in there that says "Hey, the vampire needs to hurt people to survive, be functionally immortal, and should be limited in how it can interact with its environment" or something like that. Basically laying out the minimal needed in order to not clash too badly when you answer Prompts.
Now you have me curious... Look on page xiv, there are torn paper inserts titled "What is a vampire?"
In the sequel I've really been enjoying playtesting with vampires who are never clearly identified as -anything-. They're just awful, highly motivated people and you can write their deeds in such a way that you never witness them do anything supernatural. It's a really fun way to play the sequel but wouldn't work for TYOV.