Funny thing about vampires. I actually listened to a short-story recently in which the main antagonist was fully and truly human, but he hyped up the vampire culture. Owned and ran some vampire-themed underground club and had a previous career in stage magic, so it was easy enough for him to pull the smoke-and-mirrors game to appear as though he had some sort of super-human ability to vanish in a fog and pop up somewhere else. The antagonist even had his dang incisors filed to fang-points and drank blood out of a glass to sell the appearance. Spooky. It didn't help he was on a drug-cocktail that reminded me of someone on a mix of both cardimine and steroids.
Actual vampires in Discovery? No, very probably not. But people pretending to be vampires to scare the living bejesus out of others? I can totally see that. Humans will sometimes go to odd lengths in order to con(vince) others into believing something is real.
