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Not really the anti-body count decays more quickly compared to that of a natural infection and does so dramatically especially for older people: https://www.thelancet.com/journals/lancet/article/PIIS0140-6.... This is the underlying reason that there is talk of boosters.

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It is normal for antibodies to decline after an immune response, it doesn't mean the immunity is gone, the immune system remembers how to produce them when needed.

The paper you link actually says that the memory B-cell populations appear to be maintained after the waning of the antibodies. B-cells are the cells that remembers and creates antibodies in response to an antigen (like the spike protein on the surface of the virus).

The dangers of software engineers assuming the role of immunologists. Thanks for bringing clarity to this subthread.

Older people has to have some sample bias since those without strong immune systems died.

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