Thats exactly right.
Its quite funny actually... some people dont get it. (a depressingly-ironic sorta funny)
For the treatment to be successful the doctor needs to DESTROY the nerve.
Either by clamping it, or cutting it. Either way... if you have the surgery correctly the nerve is dead. Reversals are impossible. If you have a reversal and its successful.... then that means that the nerve wasn't completely dead & your ETS surgery failed to begin with.