There were africans living in europe who started salsa dancing because it was closer to their preferences than western music. Some africans became salsa instructors and/or salsa DJs. In my area there was an angolan who told us at a workshop that as a salsa DJ he had tried for more than 10 years to play one kizomba song here and there, but people never liked it. And then suddenly, in 2012, it made boum! and kizomba exploded. He himself couldn't understand why. But no one can predict crazes - music companies would pay high salaries to someone who could predict crazes but it never was really possible, there remains always some mystery.
Few years later when urban kizz took over the kizomba scene many portuguese africans started complaining that this had nothing to do with their dance. Best hateful ranting website from an angolan that I know is this one where he rants about the french africans who committed fraud and lies. Nice read (choose "english" from the Google Translate Button):
Kizomba Informationsseite. Tanz, Entstehung, Anleitungen uvm.
www.kizomba-classic.de