As an ethical physician (and an eminent practitioner in his specialty for many years), Dr Carson would never offer a public opinion on HRC’s health. But I’d bet he could nail the diagnosis in under five minutes, based on the video alone.
On a somewhat related note, it’s no secret that the world’s major intelligence agencies devote significant resources to the assessment of the health of global leaders. It is an inexact science at best. Back in the 80s the doctors working for the CIA assessed that Soviet leader Yuri Andropov was in good health just months before he died from long-term health issues (kidney problems, as I recall). And Osama bin Laden was said to be a death’s door for years before Seal Team 6 took him out.
HRC better hope her doctors are more security-conscious than she is, because various foreign Intel services have their own medical assessment t teams and probably have their own theories on her condition(s), if not the actual diagnosis.