Vampires

I like reading this book so far but I'm not sure how it explains the “occult” truth about vampires when he didn't even mentioned the Highgate Cemetery vampire in London.
I am not sure if they were a real flesh and blood person that died and became a vampire but he was a ancient prince, people have sighted seeing some kind of spectral vampire in the cemetery numerous times, there have been nefarious satanic rituals performed in the cemetery, demons have been summoned so I am not sure if it relates to that in some way.
The author has explained historical accounts of vampire sightings and encounters and even vampire hunters but I don't see how it is connected to the occult so far.
The aurhor has not mentioned a way a person could become a vampire with the use of the occult via black magick, satanism, such as people like Gilles De Rais or possibly Elizabeth Bathory.
I have personaly met people online that are a modern day vampire specifically a (psychic or sanguinarian vampire) the sanguinarian vampire is also a satanist in a vampiric cult, he dabbled with occult, black magick or satanism and became a sanguinarian vampire (blood drinking modern day vampire) People who are like me psychic and a empath need to be careful about being around these types of people. Be careful if you are sensitive to energy, or the influence of anything demonic, evil, lower vibrational energy spirits and entities and people that are or have a lower vibrational energy and they are toxic, abusive or narcissistic and don't have your best interests at heart they can and will manipulate you and abuse you or take your energy and use that to give part of yourself in the form of energyto use witchcraft against you, or to take your energy and blood and sometimes it can be something people who are like me that are naive about the intetions people might have towards me, so sometimes myinvolvement with modern day vampires, the occult, or demonic entities was not by choce and I did it unknowingly. Be careful who you share you energy with, because people are manipulative and will deceive you, lie to you to get your energy blood or a part of you that opens up to them in a way that can be dangerous to you especially if you are a spiritual and naive and sensitive person.