If you put a fruit or vegetable into a blender, you get a mixture of water (mostly) and solids. To extract ANY organic compounds from the mixture you need an extracting solvent that will (a) solubilize your compound(s) of interest, (b) not itself dissolve in the water, i.e. is immiscible with water, and (c) does not react with the compound to be extracted.
(a) Ethyl acetate (being an ester) is reasonably polar, and I suspect that it is chosen in this case to extract a reasonably polar compound (carbazim) from the mixture [like dissolves like is a good rule of thumb for extractions].
(b) note that EtOAc has slight miscibility with water.
(c) "I don't see why this does to the chemistry..." EtOAc should not do anything to the chemistry.
Good Luck !!