Hmmm. That's the kind of thing you hear when a company has been sold. The new owner gathers up all the intellectual property and their lawyers pour over it for a few weeks checking for potential liabilities. Eventually they release everything though.
OTOH, you could have just talked to a newbie or an angry employee having a difficult day at Atwood. So wait a bit and try again.
Also, the Atwood equipment I have the tech manual that came with the RV has a schematic. Don't know if they do that for heat pumps though.
Finally, did you google the model number? Maybe someone in the universe posted a wiring diagram?