Jesus, that's not how immunity works either. The immune system isn't one thing that learns and then works. Certain components of it work like that, but certain others do not.

You can't just throw out vague statements like that and pretend it's the truth and fact. There are innate and adaptive components, but even the adaptive components, which you conveniently threw everything under, aren't as simple and straightforward as you make them out to be.

For a very "basic" introduction to the adaptive immune system the wikipedia article has some reference[1].

Part of the whole ordeal about Covid is that the whole adaptive response is nowhere near as clear cut as you make it out to be and any actual epidemiologist agrees with that.

[1] https://en.wikipedia.org/wiki/Adaptive_immune_system