Most people who recover from a heart attack will not suffer a terrible quality of life. Depending on the severity and the treatment many will live quite normal lives for decades, and die from something completely unrelated.
This is true. In fact if you have a heart attack and are treated relatively quickly, with no major injury and decreased function of the heart muscle, and continue to have regular follow up care and address risk factors, your mortality risk normalizes to those without history of a heart attack (but with CAD) and should have no functional limitations
The point stands — it’s not that the heart attack leaves you infirm, but that surviving it lets you live long enough to die of Alzheimer’s or cancer or depression.
Causes of abrupt death are being winnowed down, which the author regards with horror. I hope that they never experience the prolonged agony to which modern medicine has consigned so many, and that they are never forced by suffering to change their mind.