In general, I had thought that using accelerated production merely speeded up the game without any DIRECT gain in relative advantage for either the human or the AI.
Also the AI just love +2 food per turn, using your governor will show that well. Problem is that with AP on, Granary cities only need 5 food to grow, and the AI will end up wasting 1/6th of their food in cities with Granaries.
Finally, it's the AI's starting advantages that usually give it the difficult part of the difficulty level. AP decreases the worth of those starting advantages.
It still helps the AI, but AP will help the player a bit more in most cases.
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