Grub-X may work for a while. Rat traps may work for a while. Whatever may work for a while. And whatever works for you may not work for everyone.
Moles like earthworms which are the main staple of their diet. Sure, they'll eat grubs when they're plentiful and there's a shortage of earthworms. Shoot your own foot as you see fit. What is your proven idea today may be obsolete because of Y2K 'bugs'. if jay used grub-x and it worked for him maybe rat traps won't. He did say they haven't returned in over a year. Isn't it NICE to have options?!
After reading THE MOLE MANs stuff, i find that trapping them with a rat trap is probably just as good as trapping them any other (mechanical) way. Just don't knock an idea that didn't work for you but is or did work for someone else.