For all these people to know there's something actually physically wrong with them is massive.
IMO the broader issue is the stigma against mental illness. The leading hypothesis remains that chronic fatigue syndrome is a mental illness. Both your comment and the linked article imply a false dichotomy between "real" physical illness and "imaginary" mental illness. Mental illnesses are every bit as "real" as physical illnesses. They cause real suffering, real disability and real death. If chronic fatigue syndrome happens to have a psychological etiology, then sufferers still deserve compassion, effective treatment and proper research.
The research in question has a relatively small sample size and only compares CFS patients with healthy volunteers. Identifying abnormalities in immunological or stress-response functioning may not be particularly useful in proving that CFS is "real" (i.e. non-psychological), because we have identified similar abnormalities in patients with depressive disorders. Some researchers argue that major depressive disorder may be an autoimmune disorder, although this is far from a mainstream opinion.
https://doi.org/10.1073/pnas.1901274116
https://doi.org/10.1371/journal.pone.0138904