That is a heart covered in epicardial fat. It even says so under the image you linked to. It may be going into someone, but it's not an ideal heart. They had to note it when labeling the picture because it doesn't look like a healthy heart to any normal person. I expect, there isn't enough actual fat on that particular heart to permanently damage it, so it's serviceable. This is a picture of a comparison. Do one of those look familiar? Epicardial fat (EF) is a visceral fat deposit, located between the heart and the pericardium, which shares many of the pathophysiological properties of other visceral fat deposits, It also potentially causes local inflammation and likely has direct effects on coronary atherosclerosis.