I dunno, maybe it could make sense for a user whose primary function is to enter numbers, with the letter keys existing for the occasional label, heading, or operating system need.
Basically, think of it as a compact keyboard for a person who spends most of their time using exactly those keys that compact keyboards eliminate. The letter keys still have to exist, because computers are designed with the expectation that users will have those keys available, so they can't just cut them off the way a TKL cuts off the number pad. But they can move them to the back to get them out of the user's way, freeing up desk space for other devices, piles of paper, coffee, etc.