not sure if it makes more sense, but it is at least one way how they got it. Even though I just find German info on the topic, and no English source … and no idea how reflux fits in. Vitus Dance was a medieval interpretation of epilepsy and related illnesses. Reflux means “backflow”. Maybe it refers to how the fungus talks back?

But I found that the name Vitus may derive from the word vita, and has been interpreted as “the living one”.