Many step drivers with integrated opto-isolators (ie most of the Chinese "packaged" drives from Leadshine (and clones)) can work with both sourcing and sinking outputs (it exposes both the anode and cathode of the LED in the opto-isolator) it's just a matter of how you're wiring it. They may also be using the transceiver chips EN pin to gate the outputs OFF. The transceivers are simply buffereing the output signals and they're using transceivers (instead of basic buffers) because of the convenient pinout - been there. I don't have one of these boards and I don't have a schematic so this is all based on previous experience and speculation.
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