Are thye saying that natural resistance due to becoming infected without being vaxxed only last approx 8 months?
The study said that natural immunity weakens over time, not that it goes away:
“Health care workers who caught a Covid-19 infection, most of them happening in March 2020, before the era of vaccines, were initially about 86% less likely to be reinfected, and that protection lasted up to a year. After a year, it dropped to about 69% in workers who were unvaccinated,”
Those with natural immunity who went on to get vaccinated had a better result:
“Workers who had caught Covid-19 and went on to be vaccinated had the best protection of all, more than a 90% lower risk of getting Covid-19 again, and that combined protection stayed high for the duration of the study, which was more than 9 months.”