Definitely nonsense, he's in Yaounde for a series of concerts. These artist death reports have become far less common compared 10+ years ago.
Every week they used to fabricate death reports from peculiar circumstances, and because there wasn't immediate response videos and social media, some reports were actually believable.
When I first saw the saw the headline stating Papa Wemba (RIP) died, I thought it just another faux rumeur like the many dozens before it, but to my dismay there was photo and video proof.