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They must not think or read very deeply into their own field then, because there exists the phenomenom of immunological memory, ie the effect where memory B/T cells lay dormant in the body for decades, and upon exposure to the characteristic antigen of SARS-2 (in this case) they ramp up antibody production exponentially. This results in - theoretically, but this is definitely what happens - lower peak viral load, lower symptomacity, and thus lower transmission and a shorter disease course.

Thus even when full immunity to reinfection is gone - which btw the estimates I’ve seen are that IgG lasts a few years before the individual is seronegative again - there will still be immunological memory which persists indefinitely and vastly reduces mortality and morbidity.