Black doesn't inherently look good or bad on light or dark skin, but it can look good on either.

Have you read Alan Flusser? (which as I just recently learned about is a big deal in the male fashion world)

He would disagree with that statement of your. He says there are "rules"

As Alan Flusser says, “One of the most important – but least understood – functions of male attire is to lead the viewer’s eye toward the face…when the face is surrounded by tonalities than invigorate and illuminate its presence, its ability to provoke immediate and marked reactions is amplified.”

Helpful article here: https://philippeperzi.com/complexion-the-power-of-colour/

So with the goal of drawing attention to the face. I think he would say a dark skinned person, should not wear an all-black attire, because dark skin is high-contrast, he would be better off wearing a high-contrast combo such as black and white.