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Dominated the game? Not even a bit. Don't just look at the statistics. I assume you didn't watch the game from the start to the end. Ball possession doesn't prove anything. Besides Aston Villa had the most ball possession in the 2nd half.
Manchester City were horrible especially in that half. Aston Villa were very comfortable with the win. Manchester City defense was very vulnerable and their goal even came in the final moments. We don't have the same team having the control of the game for real. They are playing desperately. So it doesn't matter how long you have the ball as long as you don't know what to do. This is the thing Guardiola has been working on to fix these days.