Well, looking at his photos, I do not see a plug socket for the TBU base plug.
So it seems they intend for you to use a 5 pin JST harness between your TBU Apple and the mako board. It seems they didn't send him one, didn't tell him he needed it, and he says it doesn't look like they sell the cable. Im not involved, but I would think that they would or should offer the cable if its needed to be Tamiya Compatible.