This evidence is not very compelling. The genetic diversity might be indicative of widerspread infection in sub-saharan Africa, and then two immuno-comprimised

This evidence is not very compelling. The genetic diversity might be indicative of widerspread infection in sub-saharan Africa, and then two immuno-comprimised cases, are not specifically indicative of HIV. ...and then this statement has absolutely no basis in evidence: "The virus was already circulating globally in the early 1900s."