I am a huge AI enthusiast and the way I look at it, I do not see the possibility of Satoshi being an AI.
I mean, in the first place, creating an AI which could code something this complex would be a challenge greater than that of creating Bitcoin.
Second, code written by such an AI would not be all that efficient, because even if such an AI was created, it would take you a huge amount of time to train it to write optimal code.
Third, AI was not as advanced as it is now during the time bitcoin was created.

P.S. Here's a thought, maybe Satoshi created an AI and named it after himself, which coded Bitcoin. XD