Fwiw, you’re right.

Pain in the testicles gets referred to the abdomen because the nerves involved lead up there. It’s kinda like how you can slam your hand in a door, and it’ll also hurt at your shoulder where the nerves connect there

Little bits of referred pain like that happen all the time.

I don’t know why people are downvoting this. The nerve pathway does run from your groin all the way up through your chest.

Following the nerve pathway, you might be onto something