Statistically, they likely had a false positive the first test. Columbia University commissioned a study on 50k people in Qatar (covid spread was rampant there) who were confirmed positive, and after 7 months, catching and recovering from it provided immunity at a threshold exceeding the Pfizer vaccine.

Yes, there are people who have caught it twice. They are rare, and the paper highlighted that a likely explanation was false positives in the original testing.

I'll take the vaccine, but shouldn't be required to.

It was not a rapid test; he got two positive PCR tests paid by his employer.

Mind you, this is in Perú (he works at a mining firm) which was hit really hard in July and then now (one of the hardest per capita deaths).

Also, the Qatar study might not say much about the newer strands