Or not.
Medical records are private. You know, HIPAA and all that. There’s no chance an embalmer has this information for most bodies.
Here are the CDC's guidelines for funeral directors which extensively outline their duty to know all the details of the cause of death and other health info on the deceased.
Funeral Director’s Handbook: Death Registration and Fetal Death Reporting
You’ve made a sweeping claim. Can you prove it?
I’m pretty sure cause of death is on the death certificate, and last I heard the death certificate is provided with the body when the mortician receives it. Does HIPAA even apply to deceased people? How does it apply to funeral homes?