no, he was never vaccinated. he would not have caught the disease the second time if he had been vaccinated after the first disease.
that protects against the worst part of the disease, but now with the huge viral loads the unvaccinated people have with the new delta variant, they can infect others with much higher number of virus particles than were possible wit the original strain.
people exposed to the delta variant who have been vaccinated can still catch the disease, but it does not have the ability to escape the immune suppression created by the vaccination, and the course of the disease is mild.
that is why people did not show strong disease who were vaccinated but became infected by the earlier less aggressive variants. they never would really show symptoms, even if they had the mild form of the disease after vaccination, because the old variants did not replicate as rapidly.