As, far as I can tell, there seems to be no reason a deep striking Chaos unit cannot use the bonus from an allied AM vehicle with an Augur Array. As no way of improving the reliability of deep striking for Chaos units seems to be one of the reasons Chaos deep striking is not considered viable, this could be a useful little trick for any deep striking Chaos force. Someone correct me if I'm wrong, but the rules for Augur Arrays just state the bonus is applied to any unit the owning player tries to bring on from reserve, there isn't even a qualification for friendly units.

I can see a force of traitor AM being supported by deepstriking Chaos Terminators and so on.