Its web site says:
*Specifically designed for V-Drums; compatible with any Roland V-Drums kit.
That does not actually rule out other devices.
Note number: corresponds to the pads of the V-Drums series
MIDI channel: 10
This appears to imply that any MIDI drum that sends these note numbers on channel 10 can be used.
* A Roland V-Drums series drum set is required in order to use this software.
-V-Drums module without a USB COMPUTER port: A MIDI Interface and an audio cable are required.
When MIDI messages are received through a plain old MIDI cable (and there is no second MIDI cable in the other direction to send an inquiry to the device), the software has no opportunity to check which device it is connected to. So it should work.
Anyway, there is a review (in German) that explicitly says that other MIDI sources work. (So the third quote above is a lie.)