Did the UKHSA admit two doses do nothing?

The UKHSA has released their week 19 COVID report . Since they have stopped reporting on actual cases, hospitalizations, and deaths by vaccination status, I just skimmed through other sections of the report that I may not have paid close attention to previously. In the very last section, they explain how they believe booster shots are responsible for avoiding many COVID related hospitalizations in the last 6 months. They conclude with a graph showing hospital admissions since Dec 13 2021 , as well as an estimate of what hospital admissions may have been without the booster shots. Here is the chart:

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