"but the influence of skin pigmentation has not been well characterized" - your shitty article with a crappy scientific method couldn't even prove that skin pigmentation isn't a factor lmao.
"Humans living at latitudes far from the equator developed light skin in order to help absorb more vitamin D. People with light (type II) skin can produce previtamin D3 in their skin at rates 5–10 times faster than dark-skinned (type V) people. People living far from the equator were under evolutionary pressure to develop light skin, which allowed more penetration of UV radiation and helped to produce more of the essential vitamin D."
https://en.m.wikipedia.org/wiki/Light_skin
I mean it's logical either way. Black people live under strong sun and still have vitamin D deficiency more often than whites who live in colder and darker countries. Why do you think migrants are advised to take (or given) vitamind D supplements and why they often get depressed when coming to cold European countries like Sweden?
"women with dark skin color were statistically significantly more often vitamin D deficient compared to women with light skin color"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5372923/
"Keep rubbing that sunscreen stuff all over yourselves white boys. " - I used sunscreen a few times in my life. I can't remember last time I got burnt. I live in a cold country and am doing just fine. You're just a jealous ethnic racist with a small dick. As always, cope more.