@Smb14, thanks for sharing this paper.
Again I was puzzled by the data from Israel showing quite high c19 hospitalization numbers among the boosted persons. This shouldn't be the case if the jab induces effective antibodies. B-cell recognition should provide the long lasting immunity but the 3rd jabs are still fresh so this is irrelevant.
It might be a mutational escape via delta or a new variant which will conveniently be identified somewhere else and not in a highly vaccinated country.