I’m not sure what point this author is trying to make.
The unfortunate thing is we used to believe that once most of the population was either infected or vaccinated, herd immunity would be achieved and the pandemic would be at an end.
What we have learned this last year is that neither infection nor vaccines provide long lasting immunity. It is likely the virus will be permanently present in our population.
A boost or an infection will protect for awhile, and have a long lasting decrease in symptoms.
She’s making several points it seems, but a clear one is the CDC still claims recovered immunity wanes after 90 days, which is apparently now proven to be BS.

My 13 month old natural immunity protected me from my fully vaxxed wife, who coughed her COVID on me every night for a week. I took 4 COVID tests during her sickness & “quarantine” and passed all 4.
It appears I didn’t need to be vaccinated or wear a mask this whole time and COVID was over for me in December 2020.
“ What we have learned this last year is that neither infection nor vaccines provide long lasting immunity.”
Not true regarding infection. My antibodies are higher now than they were in August and October of 2021. I had Covid in January 2021. Natural immunity is both broad and long-lasting.
Not vaccinated, never will be. I am 71yo.