Siduri, I don't think it would take an inordinate amount of oil. If I'm envisioning it right, they split the eggplant, hollow out each half, bread and fry. These "boats" are then filled with the seafood (and, likely, popped under the broiler for a minute or two).
That wouldn't take any more oil than frying
chicken or potatoes or anything of like nature.
PatPat: My guess would be that the eggplant flesh, which is removed from the shells, gets chopped up and likely sauteed, to become part of the seafood filling. The filling is likely a morney sauce binding the (cooked) shrimp and crab together.
Sounds good. I'm gonna have to try something like it.