This can only help with the treatment of severe cases, which is not small success, but definitely not going to help get this pandemic over with! As far as I get it, you present the antigen and then it's up to your immune system to develop antibodies against it, and the antibodies from person A and from person B could B could be quite different, so, not sure, unless you get a shot of premade patented and expensive to produce antibodies, how this can help vaccine production.