Afrofuturist refers to the Afrofuture movement that combined Afrocentrism, science fiction, magical realism, surrealism, black history and more into an artistic movement across sculpture, fiction, photography and music. The number "419" comes from Nigerian criminal law and refers to the number of an anti-fraud statute dealing with the advance fee scam emails that everyone with an email account EVER has gotten, and it is a similar email that starts off the story:
I am Dr. Bakare Tunde, the cousin of Nigerian Astronaut, Air Force Major Abacha Tunde. He was the first African in space when he made a secret flight to the Salyut 6 space station in 1979. He was on a later Soviet spaceflight, Soyuz T-16Z to the secret Soviet military space station Salyut 8T in 1989. He was stranded there in 1990 when the Soviet Union was dissolved. His other Soviet crewmembers returned to Earth on the Soyuz T-16Z, but his place was taken up by return cargo. There have been occasional Progrez supply flights to keep him going since that time. He is in good humor, but wants to come home.As it turns out, all of these themes are specifically addressed in the story by the main character in audio logs. As for how it develops, well... you should really experience the whole thing for yourself.