I also noticed that despite the "No more sweetheart deals" AI change, the Drengin kept offering me "Advanced Propulsion" for "Ion Drives" (like I would ever accept a prereq that I no longer needed!).
I refused, of course.
Then I tested them, and tried to offer them Ion Drives for Advanced Propulsion. ...as expected, they asked me if I had been drinking, and even +500 BC wouldn't change their minds.
So, sweetheart deals are still in effect, and AIs will virtually never agree to something they want unless it was their idea.