I have seen pics of this board on line where the outer two 'holes' have what looks like metal brackets you can screw a lug onto. I suspect when you have that, you don't need the 3rd hole. Consequently, I suspect the design was probably thought through for flexibility of product offerings. Two spots for binding post -or- three spots for wires.
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Yes, most probably. I wasn't aware of this version (better than the wire version in any case).