Smyth actually cites this reference in his treatment of the direct interrogative
ἅλλο τι ἢ, is it anything else than ?
and ἄλλο τι, is it not ?
It seems from Smyth's treatment, that the former expects a positive answer, that is,
there's really no alternative, whereas the latter is genuine question, neither expecting a positive
answer, nor denying the existence of an alternative.
At least that's how it seems to me. I would love to hear others' thoughts though.