The figures for deaths only measure the number of people who die within 28 days of having a positive Covid test.
The vaccines do not completely stop infections and transmissions though they do stop cases of Covid infection getting really serious.
It is quite normal, in non-Pandemic times, for about 1700 people to die every day in the UK. The majority of these will be among thr frail and elderly, the vast majority of whom are vaccinated.
They are not dying of Covid, they are dying with Covid, but of ome of the myriad of other conditions which has brought them to the end of their natural life span. The Covid will alnost certainly have made their condition worse than it might have otherwise been, but the vaccine will have mitigated that effect significantly.
And none of this has any bearing whatsoever on the question of whether that means healthy younger people should get vaccinated. To know that you need to analyse the statistics in a lot more depth, looking at the death and serious illness rates in each demographic cohort and also normalising for comorbid conditions and comparing between vaccinated anx unvaccinated in each subset. That data clearly shows that it is definitely beneficial for everyone over the age of 18 to be vaccinated and probably mostly beneficial for 16 and 17 year olds to be vaccinated. That has been proven rigorously.
Although the vaccine has been classed as safe and effective for 12-15 year olds it is less clear cut that it will be beneficial for them because the real rate of death or serious illness from Covid is so tiny that the small risks of side effects from the vaccine are not necessarily justified on purely medical grounds. The balance of risk vs benefit does shift significantly if you also take into account the disruption to education and everything else in life that continues to be the major cause of suffering for this age group in the pandemic, ao of vaccination fir this age group would make a serious difference to the magnitude of those disruptions then it becomes definitely beneficial. However the amount of difference it will make can only be judged in the context of knowing what public health policy will be so it can't be judged by medics.