The OP is reading far too much into the data.
The article is about low diastolic pressure in patients using drugs to lower blood pressure. There's no basis for a conclusion regarding those with naturally low diastolic pressure.
By the same token, the low diastolic pressure may be an indicator of a problem rather than a cause. By that I mean it may be that the low diastolic pressures may be the result of aggressive blood pressure treatments. So, it's possible, or even plausible that the treatment itself is the issue, or that the underlying need for such aggressive treatment may be the issue.
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