where you getting that? https://www.bbc.co.uk/news/articles/cv22ydr7v3ko3 out of the 4 are confirmed Sudanese
The light skin with the long face is Barawani or Reer Xamar I think:
The dark skin is Somali. I think the EL Gamri kid might be Sudani? in the documentary, there was another character who was flees and then is caught in Holland. He was definitely farax.
That said, the police in the programme does keep referring to them as "Somalians" and there is almost agenda of whitewashing the victim (drug dealer) and his white Hooyo, who is an utter failure of a mother and human being. if these guys are mostly Sudani and the Somali element was overplayed it would be an example of racism against Somalis.