We also know what causes the majority ME/CFS cases. They are typically caused by a prior viral infection. It really doesn't matter which.
Do you know the previous SARS outbreak similarly caused post-viral syndrome illness?
Experts should have known or at least listened to everyone with ME/CFS who knew this was coming.
https://bmcneurol.biomedcentral.com/articles/10.1186/1471-2377-11-37