They all provoke the immune system to generate antibodies (and T cell responses and other responses) that recognize active infections, but those go into action

They all provoke the immune system to generate antibodies (and T cell responses and other responses) that recognize active infections, but those go into action only when that infection is actually recognized (which can be a false positive with disastrous results - see the 2015 science article about pandemrix) They have no known mechanism of action when there are no recognized antigens. If they do, that’s new science, and applying Sagan’s Criterion: extraordinary claims require extraordinary evidence.