Ok I see. I’m from Italy and I know what medications my grandfather takes, that my grandma had cryosurgery for a malignant mole, and when my father goes to the proctologist.
Also: families usually go to the same doctor so even if you don’t personally know something, your doctor probably will.
The article has a population point of view and risk means the ensemble probability of a given sample of people having said disease. It’s correct that risk is confusing from a single person point of view where probabilities do not make sense.