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doctors... say studies on Covid-19’s closest-related virus to infect humans, SARS, revealed that those who had acquired natural immunity in 2003 remain protected even now. They also maintain that, even before the onset of vaccination campaigns, most people had become immune to Covid-19...

For starters, there are no studies on sars-cov-2 that shows natural immunity nor immunity for people infected with sars-cov-1. Further, Principia Scientific International (PSI) is a conspiracy blog run by an internet ghost that goes by the name of John O’Sullivan. Principia Scientific International has never done any scientific studies, nor have they funded any scientific research. Principia Scientific International has long been an anti-climate research blog and has just recently joined the fray as a "virology expert" blog as a result of the pandemic.
Principia Scientific International has nothing to do with science and everything to do with political conspiracies.
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