Actually, it's not true. LE items are eligible, as long as it's NOT special packaging. Shop/Cook is eligible. I B2M'd for Dish It Up at The Bay Queen/Bay today. They didn't give me a hard time at all. I also B2M'd for Flamingo recently (Eaton Centre MAC store).
I would recommend asking on the MAC Live Chat - they will tell you that it's ok, and print out the chat transcript and take it with you. This is how I managed to B2M for cremesheen glasses (at the Bloor/Bay location) immediately after they changed the rules and it wasn't really allowed (but the Live Chat person wasn't up to date on the changes, and because I had the printout they allowed it at the store).
I do have a Live Chat transcript saying that it's ok to B2M for Shop lipsticks - PM me with your email address and I'll forward it to you.