Given a choice when I attack of going left middle or right the AI will always choose correctly where to place its armies.
I'd encourage you to put this to a scientific test where you flip a coin to determine which territory to attack. You'll find that the AI predicts you 50% of the time exactly.
What's more likely that you're simply noticing every time you guess wrong and not noticing the times you guess right, which leads to confirmation bias.
The AI actually enters all their orders before you do, so from a technical perspective it's impossible. Not only that, but the AI is open source, so you could even read source so you can read it and see how its making its orders.