Walaahi this is based on true.This is what Saudis originally looked like.
There's a difference between Black and Dark-skinned. The prophet was 100% Arab. The famous Black person to have accompanied the Prophet SAW and very well known in that Era was Bilal Ibn Rabah RA. But the fact that the Prophet SAW was Dark-skinned or Light-skinned is something out of our knowledge. The life of the prophet SAW was well documented and transcripted by his wife Aisha RA.
Black isn't a race, you can be black and an Arab.
I think you watched too much Nation of Islam. It really doesn't matter what the Prophet SAW race was, his wisdom and the knowledge he passed down is what matters. He was 100% Arab.
None taken and and get lost.