Joe Wilson was Deputy Chief of Mission (DCM), Bujumbura, Burundi (1982-85); DCM Brazzaville, Congo (1986-88); DCM Baghdad (1988-91), and US Ambassador to Gabon, Sao Tome and Principe (1992-1995). He was never US ambassador to the Congo.
You are correct; I was being sloppy with my description of his title in the midst of trying to clarify which Congo he was in. Thanks for noting the correct title.