Cardiovascular disease and cardiac valve disease are entirely different and separate, and therein lies the confusion.
Apatite (calcium, phosphorus and other trace minerals) is the substance of the valve calcification. It's crusty and brittle, and is similar to the apatite mix that your body generates to create bones and teeth.
Fats, cholesterol, and blood cell debris are the mainstay of atheromas, which are the artery blockers in cardiovascular disease. They are basically soft, with some calcification forming and layering in after they have already developed to some extent.
People with bicuspid valves often have preternaturally clean coronary arteries (although not always), even though their valves may be crusted to utter uselessness. It seems to be a common, linked, inherited trait. By the same token, most people by far who have even terribly bad cardiovascular disease never develop valve disease at all.
Statins have been studied numerous times (such as the SEAS trials) to determine if they can slow down valve calcification. The results have been in all cases that they absolutely do not change the rate of valve calcification or the average life of a tissue valve, although they do slightly reduce the overall number of deaths from other, cardiovascular issues.
They just aren't related, except by the accident of their location being in and near the heart.
The accelerated death rate for people with cardiovascular disease who have higher serum calcium levels makes sense, as when calcium is deposited in an outer layer of an atheroma, it becomes a harder blockage in the artery and interferes with its natural ability to expand and contract, as well as making it more difficult for drugs to reduce the atheroma's size. Also, bits that may break off are rigid and more prone to lodge permanently in a bad place, causing a heart attack or stroke.
Taking calcium supplements is not necessarily relevant to serum calcium levels, which are more dictated by other bodily chemical functions. Depending on the body's mode, it may steal from the bones to raise the serum calcium or lower it too much and leave painful calcium deposits in joints. Vitamin D plays a large role in serum calcium management, as well as in the original absorption of calcium from milk and all other sources.
Calcium also plays a role in regulating blood pressure. Calcium channel blockers slow the electrical pulses in the heart (and the arterial wall muscles) by affecting the heart's electrical fast-tracks: the calcium channels. CCBs block some of the electrical sensitivity of the heart muscle, making it beat less strongly and more slowly, thus lowering blood pressure. This again speaks to cardiovascular issues, rather than valve problems.
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