Yeah, that was him. He was seen as one of the best atalaku's of Congo Brazza. He took Brazzaville in 1999 by storm with his animations in Extra Musica International's first album Super Helico. The dance of his cri Helico inspired Wenge Maison Mere to take the dance to use it in Solola Bien.
I think that his voice changed, because of drinking and smoking much. Don't also forget that it isn't for falsetto atalaku's to mantain their voice 20 years long.