How did natural immunity go from being the best vaccination in 2004 to not being much of a vaccination at all in 2020, 2021 and 2022?

My oh my how Dr fauci's opinion about natural immunity has changed since 2004.
When he was asked if a girl who has had the flu for ten days should be vaccinated his response was…"Well no if she got the flu for 10 days she's as protected as anybody can be because the best vaccinations is to get infected yourself".
" If she really has the flu, if she really has the flu she definitely doesn't need a flu vaccine if she really has the flu". " She doesn't need it, the most potent vaccination is getting infected yourself".
How did natural immunity go from being the best vaccination in 2004 to not being much of a vaccination at all in 2020, 2021 and 2022?
How did natural immunity go from being the best vaccination in 2004 to not being much of a vaccination at all in 2020, 2021 and 2022?
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