More information about the specific tests used by ME/CFS doctors for each ME/CFS virus is found in this
Viral Testing in ME/CFS article.
One thing to bear in mind is that it might not have been the molnupiravir which put you into remission; it could have been the acute COVID infection which did that. The theory is that the immune activation from fighting COVID might also clear other ME/CFS viruses at the same time.
Or it might have been the combination of the immune activation from the COVID infection plus the drug which cleared your other ME/CFS viruses.
If you look at
this poll on what happened to existing ME/CFS patients when they caught COVID, result show about of existing patients 40% had no long-term change to their health level; another 35% got permanently worse; but around 10% actually got permanently better after acute COVID.
So COVID can sometimes permanently improve ME/CFS.
This reddit report details another existing ME/CFS patient who took molnupiravir for an acute COVID infection and got much better for a month, before slowly relapsing back into ME/CFS.