Coroners use hospital records, what they find during the physical autopsy and observations from family members/friends of the deceased to determine the cause of death.
Perhaps they obtained this info from the records or from speaking with the family members/friends.
LOL — Embalmers are not Coroners.
Or not.
Medical records are private. You know, HIPAA and all that. There’s no chance an embalmer has this information for most bodies.