I am happy you friend recovered, pgs and didn't need to be hospitalized. There are many stories of people who had similar experiences after having contacted the virus. If a person is otherwise healthy, they don't need medical care - self-isolation is all that is needed.Yup , that is how it works alright . An outbreak happened at my friends place of employment, he got sent for testing and came back positive . Saw no medical personnel, was told to stay home and isolate for two weeks . That was it caught and recovered , saw no doctor or nurse had no further tests was just automatically recovered . Do you believe a health certificate if that is how they are arrived at ?
That said, he would still have had to be checked out prior to going back to his job to make sure he was now virus free.