There are quite a few things that can cause groin pain in the athlete and surgery is not always the best answer. If it is indeed Gilmores Groin then surgical intervention can have positive effect.
The confusing thing about the condition is the potential for overlap of many other conditions in the same region. It is also commonly referred to athletic pubalgia, sports hernia, or groin dysruption. The blanket term that covers all conditions is "Chronic recalcitrant groin pain"
It is very important to seek multiple opinions before continuing with a proceedure (especially considering the complexity of this proceedure) as it is hard to accurately diagnose the condition. Hard to see (if at all) onMRI due to the weak wall opposed to an actual visible hernia.
Summary: Confusion for you. Best thing is to seek another opinion and dont mention gilmores groin to the next doc. Let them make up their own mind. PT can help the stabilising structures around the pelvis sometimes with suprising results.
Good luck.