Either he flew over to TNN in australia, held them up and made off with a single set of pads...
Or they send him things to test.
I'm not sure about that second one though, sounds farfetched.
You could even send the frame away to JAF bikes and ask Josh to stick some proper mounts on there.
It'll work better if you're based in England, I can't tell because you haven't filled out the location thing.
Dual disc power!
I don't think it would be universal though. Preferences and that. Mind, seems like the manufacturers make choices for us regardless, so who knows.