I don't know for sure, but I'm guessing they never really thought about it because they supply the mating connector for free with each autopilot shipped. I suppose they figured that since the connector was/is supplied with the AP, then it wouldn't matter. That being said, I also be we'll see a change/add to the manual as suggested because for those who either don't have the mating connector or want to do the wiring early without purchasing a pre-made harness it would be good to identify in the drawings.
Cheers,
Stein