Answer: no, it doens't work on UUVs. And I found that the ping bug has affected UUVs too in the process.... No pings for enabled UUVs in 1.03 and no active data reported. And no, the torp mod didn't do it, I checked... duly reported to SCS.
Anyways, so just because this torp mod doesn't let us change uuv depth yet.... doesn't mean that the final version won't! Right, Amizaur?! You know you want UUVs that can cross the layer on command! (give us an inch, we'll take a mile...)