Those deaths, unfortunately, were going to happen at some point. We're seeing the same thing in Australia and New Zealand. This virus was always going to get its pound of flesh. I think some of what this graph is indicating is merely the delayed response that was always going to happen. I'm not sure it indicates anything, in particular, about the general efficacy of the vaccine.
(And keep in mind, I've never been a huge proponent of the usefulness of a vaccine for this type of virus/disease. Our best hope was that a vaccine would provide benefit to the most at-risk, either through reducing infection rate, or attenuating infection severity.)