From a past thread they were unable to get the burger at Dinner but you can get it in the lounge. PlanDisney's response seemed to indicate it was up to the Chef, so very possible that they say no.
It is odd, but I agree with @Disneydawg74 its not about availability, since you can order it in the lounge. I think they are trying to elevate the dining experience. It's $8 less then the current least expensive item the 6-oz Top Sirloin Steak at $32. Its the most expensive thing on the Lounge menu. All costs; food, prep, staff, busing, etc I can understand this to some degree. Trying to recruiter and retain quality staff for this environment makes it all make even more sense.
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