Given that Tippit never tests, he has no credible evidence of immunity.
I mean, given that I don't social distance, don't wear a mask, and have been living in public for the duration of the pandemic, including shopping, movies, playing poker, casino gambling, sporting events, what do you think the likelihood is?
I have been sick twice since the pandemic began, the first time was almost in all certainty Covid, given the uniqueness of the symptoms, and the second was this November, when I had mild cold-like symptoms. So either I had a common cold the second time, or it was Omicron whose symptoms were mitigated by my likely prior Alpha infection and immunity.
The reason that I never test, is because the symptoms were never so severe that I absolutely needed to know, combined with the likelihood of false positives or negatives. In other words, the same reason you (hopefully) don't test every time you get a common cold. I'm not equating Covid to the common cold (although Omicron seems to have similarities), I'm saying that the symptoms didn't warrant any further analysis. Maybe I just got lucky, or maybe the disease is only 2.6x more lethal than Influenza even given what are likely ridiculously inflated mortality stats.
Then there is the issue of not wanting people to stick swabs with dubious chemicals up my nose, and my warranted distrust of any and all deathcare providers.