The CEO of BioNTech said they don't know for sure but speculated that memory B cells may keep hypermutating after a third shot which could result in the improve

The CEO of BioNTech said they don't know for sure but speculated that memory B cells may keep hypermutating after a third shot which could result in the improved effectiveness against Omicron. Or that's what I understood with my very rudimentary knowledge of biology.