Before epilepsy was understood to be a neurological condition, people believed it was caused by the moon, or by phlegm in the brain. They condemned seizures as evidence of witchcraft or demonic possession, and killed or castrated sufferers to prevent them from passing tainted blood to a new generation.
I agree. Its a technicality. Yes we dont have free will. But just in the sense that we can decide according to our free will, just that all the factors forming that decision have already happended and would have happened any other way. So free will exists, but its just a very complex illusion.