The headline seems bogus but the article says that "naturally occurring coronary heart attacks due to atherosclerosis are virtually non-existent in other mammals." Atherosclerosis is the cause of only "one-third of deaths worldwide due to cardiovascular disease" so other causes could still apply to other mammals. For example, "chimp heart attacks were due to an as-yet unexplained scarring of the heart muscle."

Of course we can give rabbits atherosclerosis by giving them high cholesterol from a diet they don't eat in the wild. But in humans, "in roughly 15 percent of first-time cardiovascular disease events (CVD) due to atherosclerosis, none of these [risk] factors apply," where risk factors include "blood cholesterol, physical inactivity, age, hypertension, obesity and smoking."

So the study explores a possible reason for that.