The T193 wasn't on the list of "candidates" on that thread I referenced, so that's not too surprising.
The ones that are listed are: C168, C168i, C257, C261, V175, V176, V177, W220, and W375. It appears that the determining factor is that those phones are built on Moto's G24 cellphone "base module" and have a TTL serial interface wired to their headset jack (the datasheet says the module supports both serial and USB connections, so the module is probably also used in some USB-only phones).