I would have loved to see some of her advice and information dis-aggregated by race.
Low Vitamin D levels of are not evenly distributed among different ethic groups. e.g. "53%–76% of non-Hispanic blacks [ had low vitamin D levels, in the Southern U.S.] compared with 8%–33% of non-Hispanic whites [0]".
Thus the risk-reward considerations of taking vitamin D are likely different for dark-skinned individuals than for light skinned individuals.
I have to assume her advice at the end is targeted at light-skinned people. As a dark-skinned person myself, I'm irritated that she couldn't bother to at least mention the above issues.