I don't think that's their fault.
Since it's releasing exact versions of the original carts, it would be FFIII.
That, and SquareEnix is probably not thinking of patching the SNES ROM title screen to say IV or VI. Because, y'know, they don't give a shit if it's not the Tablet version.
Doesn't mean I have to agree with it.
They had a valid excuse in 1994 when II, III, and V never had Western releases. This is no longer the case.
And I can't chalk it up to "hur hur westerners r dumb plebs and wouldn't know the difference", because if that were the case they'd rerelease Mystic Quest on it instead.
This, like the NES Classic, is honestly little more than a glorified emulator. With that being the case, just go grab one of the
many patched ROMs that make no changes to anything except correcting localization mishaps like that and be done with it. It's not a difficult thing to correct by any stretch of the imagination, and the reason they had for it 23 years ago is no longer valid, so I have no reason to believe the continuation of the localization screwup is anything more than laziness.