I'm guessing the news agency doesn't want to state that they are Africans who immigrated to Romanian, and from Romania to the UK.
Africans immigrating to Romania hasn't been a thing in 20 - 30 years, we used to get a lot of them coming to study medicine here and some remained but nowadays the number is pretty much zero.
Girls from Moldova do this though, they claim citizenship based on a long lost relative and once they get the passport they leave for another country in the EU.