Looks like CFS may have been looked at in this. https://www.sciencedirect.com/science/article/abs/pii/S1876382019314076 View full text © 2020 Published by Elsevier GmbH.
Didn’t bother to read the article but it is always worrying when there is confusion of terms even in the abstract. There seems to be significant confusion between the symptom of chronic fatigue that features in a very large number of conditions, the hypothesised condition of idiopathic chronic fatigue that presumably displays the symptom of chronic fatigue in isolation and the distinct condition of Chronic Fatigue Syndrome with multi-system involvement.
Why would they look at studies of 'herbal medicines' and lump them all together as if they were all the same. Might as well do a systematic review of 'drugs' to treat some vaguely defined symptom. Equally useless. And why if, as they acknowledge, the quality of evidence is very low, would they suggest herbs might be useful?
Maybe they once met someone who just happens to sell 'herbs' and felt like doing them a favour, for karmic reasons?
Maybe the sellers of herbs are the business partners, or sleeping partners, of those who recommend their services. Such arrangements exist.
I assume he doesn't recommend 'herbs' in general, but some specific ones, and as a research project, I think. He's not a clinician.
TB;DR (too bullchitty, didn't read). and Sounds like using a bundle of stimulants which most wouldn't recognize as such to juice sick people up. For us, that works great. Until the crash. Ooop, study's over, no more sequalae data accepted, you must have some other thing going on.