from the Executive Summary...
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Vaccine effectiveness
Several studies of vaccine effectiveness (VE) have been conducted in the UK against different COVID-19 variants. Vaccine effectiveness against symptomatic disease with the Omicron variant is substantially lower than against the Delta variant, with rapid waning. However, PROTECTION AGAINST HOSPITALIZATION REMAINS HIGH, PARTICULARLY AFTER 3 DOSES. (emphasis mine)
Population impact
The impact of the vaccination programme on the population is assessed by taking into account vaccine coverage, evidence on vaccine effectiveness and the latest COVID-19 disease surveillance indicators.
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and then, further down, you'll find this, along with a table I can't copy easily...
Effectiveness against mortality
High levels of protection (over 90%) are also seen against mortality with all 3 vaccines and against both the Alpha and Delta variants with relatively limited waning (6, 11, 12). Vaccine effectiveness against mortality with the Omicron variant has been estimated for those aged 50 years and older by combining the risk of becoming a symptomatic case with the risk of death among symptomatic cases in vaccinated (all vaccines combined) compared to unvaccinated individuals (Table 2). At 25-plus weeks following the second dose, vaccine effectiveness was around 60% while at 2 or more weeks FOLLOWING A BOOSTER VACCINE EFFECTIVENESS WAS 95% AGAINST MORTALITY. (emphasis mine)
Vaccine coverage tells us about the proportion of the population that have received one, 2 and 3 doses of COVID-19 vaccines. By 27 March 2022, the overall vaccine uptake in England for dose 1 was 69.5% and for dose 2 was 65.3%. Overall vaccine uptake in England in people with at least 3 doses was 50.9%. In line with the programme rollout, coverage is highest in the oldest age groups.
We present data on COVID-19 cases, hospitalisations and deaths by vaccination status. This raw data should not be used to estimate vaccine effectiveness as THE DATA DOES NOT TAKE INTO ACCOUNT inherent biases present such as differences in risk, behaviour and testing in the vaccinated and unvaccinated populations. (emphasis mine)
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The COVID-19 virus has mutated over time and the vaccines' effectiveness in preventing infection has waned because of them, but the vaccines' primary protection from hospitalization and death has remained high...thank God. No vaccines are perfect, especially when they are decidedly not universally received thus allowing more mutations.
Take a moment and review the example given in the 'Sub-Link' I provided earlier to understand how fundamental data can get mis-interpreted...that's what's happened with your interpretation.
The report Summary tells the story in a nutshell...vaccines are the way to go...including BOOSTERS...case closed.