I've read the full study elsewhere and, unfortunately, the authors summary in the abstract is incorrect (which may be why no one references that study anymore).
Provi at does below 50mg doesn't have a
statistically significant inhibitory effect on LH.
However, there is a difference between having a statistically significant effect, and having
no effect
Provi, even at 25mg, still has an effect on LH but it isn't anything to be bothered about in normal circumstances (hence not significant).
However, PCT is not a normal circumstance since your actively trying to recover your natural hormonal production. So, IMO, this is where Provi will do much more harm than normal.
In short, it has no place whatsoever in pct.