There seems to be some confusion as to the role Brilacidin could play.

Brilacidin could be a TREATMENT for the COVID-19 virus and its associated complications -- like bacterial infections and severe inflammation that ultimately can lead to multiple organ failure or permanent kidney damage.

Brilacidin also was being evaluated for a completely different use, as a possible adjuvant for vaccines. An adjuvant is a chemical that makes the vaccine work better, but it is not the BASIS for a vaccine. A vaccine works by giving someone a dose of a killed or attenuated (greatly weakened) virus or bacterium. That weak or dead microbe gets the immune system to make antibodies to it, so that when someone is exposed to the actual illness, the antibodies jump in and stop it in its tracks. It's that microbe that is the actual antibody-inducing substance -- the adjuvant just helps it along. There's some evidence that certain patients have bad reactions to some vaccines because of a reaction to the adjuvants, not the dead/attentuated microbe.

EDIT: See Mo's post right before this, which gives more details about Brilacidin's possible role.