Am I to imply that you are claiming that vaccinations are ineffective, because a fully vaccinated individual with a compromised immune system was infected with COVID, most likely from a non-vaccinated individual, and that person died from that infection?
That is like making the claim that speed limits and seat belts don't improve safety, because a family of 4 belted in and driving the speed limit dies in a head on collision with some asshole who was street racing on a public street.
Both claims would only be made by someone who is either dishonest, or clueless.