No. Coronary calcification is but one stage in the process of atherosclerosis. So he could have had severe atherosclerosis without extensive calcification. This is why coronary CT is not a perfect test for prediction heart attacks. Furthermore, coronary CT cannot assess the tendency of the blood to clot, which is a function of both local and systemic factors. A useful guideline is that physiology is never as simple as one test or one variable.
In case you're still checking this thread, I just wanted to let you know how much I appreciated your efforts to educate and correct the record. I know a little about this area, and know enough to see you know more than I do. It's a sad, recent phenomenon of software engineers projecting the epistemic structure they deal with day-to-day onto the medical world.
(quick edit) It's profoundly sad to watch http://quantifiedself.com/2010/09/seth-roberts-on-arithmetic... all the way through as a result of this story. It's complicated... maybe it's a failure of medicine, of medical care delivery, education, etc but a room full of educated people laughing off the comments by that person warning of artherosclerosis/stroke and Robert's responses... it's just not a good sign.
