I'd have to disagree with this. The actor is of British-Zimbabwean decent from what i've seen, so he actually of South African decent.
My guess is he understands African culture pretty well given that at least one side of his family is from the continent of Africa .
I don't know if it adds to the colorism agenda or not, but if he fits the alleged new role he's up for, I wouldn't be against him being cast, and I'm much darker than he is as a Black man.
Again, I doubt that the vast majority of African Americans will have an issue it. I could see those who analyze colorism in depth be hung up on it, but the majority wouldn't have an issue with it.
We have lots of shades in the black community including a few of my cousins who are as light as him, so I don't even think that would really be an issue unless for someone who's that hung up on his skin tone.
If he were a recast of Boseman's T'Challa, that would be one thing. But he's rumored to be playing a different character , so the vast majority of Black audiences would accept him for who he is because again, African Africans and African Americans aren't a monolith in terms of skin tone, and lots of us have people of all shades of black in our family whether it be immediate or extended. Trust me.
If there would be any issue, it would be anyone else taking the mantle aside from Boseman, including Shuri or a new character whether they were darker skinned or not.