There's a bunch of system voice packs that replace the announcer (mostly playables but it includes a few that aren't like Gii/Nago/Kajun/etc).
Jubei has one of those, which wouldn't say much on its own... but then he has a character select screen call out in all 40 voice packs with the rest of the playables. The character select call outs appear to be in release order, and Jubei is after Mai, so he's likely intended to be DLC for later.
Not that he's a lock or anything. You usually do voice recordings in batches, so they might have just included just in case they finally figured out how to get him to work in the game. "Too short" doesn't seem to be an issue anymore with Es around, at least. She's not much taller than he is.