Even their comment about the impact of vaccines can be explained in this context:
> The vaccines are certainly helping. Before they became available, about one-third of everyone infected with the virus came down with long COVID, Koralnik says. “There is brand-new data showing that if you’ve been double vaccinated and boosted, then the risk of developing long COVID, if you get COVID, is probably more like 16, 17 percent
If your state of mind and anxiety about things are included as “long COVID” symptoms, it makes sense that the peace of mind offered to people who get vaccinated would put them in a better head space to not experience these symptoms regardless of how effective the vaccines are.
None of this means that it is impossible to have lingering COVID symptoms. Of course that can happen, but that can happen with any disease.