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No, because young adults have low vaccination rate, so they are still circulating Covid but dying at low rates.

Meanwhile, old adults are almost all vaccinated, but have a much higher CFR.

Thats not a "No", it is a "Yes", you're just trying to explain it

Although you might point at several things, including more than 50% of population being vaccinated

It still shows that the vaccine might not be that effective.

In the UK there is also the strange 12 weeks interval between doses, instead of 4 recommended by manufacturer, and used in other countries

How is it "herd immunity" If the virus is still spreading (and killing)?