The AHA is probably exercising risk management. While dietary cholesterol doesn't affect blood cholesterol for most people, for some people (hyper-responders) it does raise blood cholesterol. Which is a bad thing.
So rather than saying "for most people it's OK, but be sure to get some fiddly blood work done a few times!", the AHA just says "don't do it, in case you're a hyper-responder".
The studies regarding eggs and cholesterol compare the effects of eating one or two eggs per day to the effects of eating none. There is not much difference between the two diets being compared. There are no studies that compare the effects of an egg free diet to the effects of eating 6-12 eggs per day. If you are eating a bodybuilder diet it's worth getting a metabolic panel to get an idea of what's happening inside.
So rather than saying "for most people it's OK, but be sure to get some fiddly blood work done a few times!", the AHA just says "don't do it, in case you're a hyper-responder".