A lot of the article makes sense, but certainly isn't proven science, one way or the other.
Common sense dictates to do what you evolved to do. Dark skinned people lived near the equator and can deal with massive doses of solar radiation. Far northerners evolved to get sun when they can. The problems arise when switching places. Dark skinned people living in the north don't get enough sunlight/Vit D/what ever, and northerners get too much if they go south, like XXXer's Montrealians in Antigua, a recipe for sunburn and hence skin cancer.
I am of Mediterranean descent, and live in a Mediterranean climate. I have always got a lot of sun, still do. I tend to slowly tan starting in the spring and fade in the fall. I avoid sunburns. So far so good. Never had a BP problem (until this year). I assumed it was stress, (loss of the house in the fire, rebuilding, etc), but I am also not out in the sun nearly as much this last year (by a large amount,) due to living in an apartment, not cycling, etc. My first winter in vet school we had zero sun for months on end, and it really affected me. I definitely feel better with regular sunshine.