I think Fury’s point is that natural immunity is not better than vaccination for all diseases.
Rabies is the perfect example, as is Tetanus. Vaccine induced immunity is obviously better than being dead.
A vaccine if proven will work against a disease that doesn’t mutate. Rabies doesn’t mutate. Covid mutates in minutes once it enters the body. The original china virus is long gone likely never to return. Meaning any vaccine to cure the china virus is futile as it doesn’t exist in the wild.