Some defector from the Enclave wouldn't have the old FEV. Most of the scientists, especially those who worked on anything revolving the FEV, the only ones with access to it and the formula to make it were nuked. All that remained of Enclave were those on outposts they had established fairly recently (IIRC) in Fallout 2. So no, that would not have happened. It is not believable. Could someone from the Enclave in Fallout 3 have had access to V87 and deserted once Mobile Base Crawler got blown up? Sure. Problem is... They had FEV before Fallout 3.
"To overcome the limitations of metal synthetic materials, the Institute endeavored to create synthetic flesh, with the first research initiative beginning in in 2178. Under the auspices of Doctor Frederick, FEV samples served as the starting point for the new, organic synthetic program despite the objections of some members of BioScience.[11] Both women and men were abducted from the Commonwealth and submerged in the Institute's modified FEV, their mutations carefully tracked and extensively investigated. Successful mutations would be monitored to ensure survivability, then tagged and discarded.[12] Research ground to a halt in March 2224"
What you just said is made up fanon. In the wiki I saw literally no mention of the Enclave at any point. They also didn't release the muties to make sure that the commonwealth was kept shitty so no one could challenge them. They just released them. That's it. They tested them, tagged them, released them.
And I don't get what the last two paragraphs are even about. I understand fully well why someone with a clear mind would not want to be a super mutant. That doesn't mean that a cure should be available though. We're talking about, not mutating something in a controlled manner, but regressing something. Something that can down to the DNA alter things to remove aspects and mass. It's not you're a human in a super mutant meatsuit and you can just peel the layer off. (I would like a visual representation of this from an artist though)
What do you think realistically the result of that would be? Especially the first one? He wouldn't turn human. He'd turn into something probably worse off than a ghoul. I don't care about why someone wants to revert a mutation, I care about the fact that he managed to do it.
The whole thing is childish and written without thought. There is no deeper meaning to it. It's literally just them throwing their hands up in the air and going "I don't know what to write about, how about some mutant turns human that good? Good? Good, phew that was hard work, I need a nap and some milk."