I do not claim that I know for sure, however, my stance is one of extreme skepticism towards any assertion that covid 19 damages the immune system of those who have not been vaccinated.

Certainly a covid 19 alters it-- our immune systems learn to defend against it, as is normally the case with any other infection from which a body recovers.

There are too many interests that have been and continue to be served by presenting covid 19 as being more dangerous than it in fact is. This was, of course, the entire argument behind the lockdowns, the masking, and the vaccines being both recommended and mandated.