Sorry,I don't have an answer for you but you might try posting this on the Universal Studios /Resort Board. There are some really great people over there who will have that information for you. By the way I really appreciate all your awesome pictures!!!!
Tchoup Chop definitely does not offer Universal Fan Club or AAA discount. I don't believe it offers a Loews discount either. I also don't recall hearing about it pop up as a radio station discount-of-the-week.
The only "discount" that I know they take is the OpenTable dining check.
I had no problem whatsoever using a $20.00 OpenTable dining check there earlier this month.
(OpenTable is the reservation system they use. Restaurants participating on OpenTable can be booked online at www.opentable.com . By creating an account on OpenTable, you get points for each reservation you fulfill (usually 100 points per reservation). When you reach 2000 points, you can redeem your points for a $20.00 dining check that can be used at any OpenTable restaurant.)