Surely this means that "long covid" is not caused by the coronavirus infection itself, but by staying at home too much and a poor diet and not enough exercise. Is that not what this meant?
https://www.pbs.org/newshour/health/these-patients-tested-ne...
It is also true that staying at home and listening to media dramatizations causes stress, which can cause the aforementioned symptoms.
So, if you put two and two together, you may come to the conclusion that many or even most "long covid" cases are psychosomatic and not caused by the virus itself, even in those people who actually were infected.
Like I said, this needs to be differentiated from symptoms that are clinically verifiable long-term effects of respiratory illness and viral infection.