NO NO NO
Not true. I can assure you the majority of the people who claim epi cured their gyno didnt have GYNO in first place. Self diagnosis from a youtube video and google images does not substitute for a doctor's diagnosis. There are a number of things that can manifest symptoms similar to gyno.
The entire basis for the companies who market epi as a cure all for gyno is an article from a few years ago that found that the non methylated version of epi reduced gyno. There is no evidence that the methylated form (epi as we know it) retained these same characteristics. It (epi) is a steroid and it has no place in the PCT timeframe.
Seems a little counterintuitive to run a steroid to get rid of a side effect of another steroid eh?