No ID required there.
I was under the understanding that anyone can go to Gordon's Galley. I had a worker there say the employee price was indeed for employees and the guest price was for anyone else. The secure areas down there are all badge-access areas. There is no code on the elevator or anything. I believe the person who said that the non-employee can't be down there sounds like one of those non-customer contact employees (ramp, etc). Most flight attendants and pilots would be a little more tactful about something like that.