Acupuncture for post covid works on the whole person not just the symptoms. When a patient is weak and has covid the basic energy of the person is compromised. Their immune system their lungs their stomach all are weakened by covid. If when they get better they are still weak but manage to be ok all that can happen is they can pick up another virus or any form of illness which can compromise them and allow post covid to highlight the same weaknesses that they developed with covid so it manifests in great weakness
The post covid man I treated could hardly walk and felt completely exhausted but after 8 sessions he is running 40 miles a week now.
You can read more about acupuncture for post covid here.