That has been explained to him about 50 times on this board and on others. He rejects the science of it, and thinks he is superman because he survived covid. The evidence is that getting vaxxed after having the disease gives one more protection than having had the disease alone. New strains overcome the natural resistance of having had an earlier strain. I also have the anecdotal case of my grandson, who got an early strain, got sick, recovered... then last winter he got it again, this time really sick, almost to hospital level, breathing difficulties. He definitively tested positive both occurrences. Freddie is asking for a second infection but I am past feeling sorry for willfully ignorant people.
In spite of the fools insisting on prolonging the disease, it sure seems like the worst is over.