Yes and No. The problem is that the AI doesn't really use a civs strength. For example, I very much doubt they prioritise capturing cities with non-corp units when playing as the Zulu. A human player would always do that. So while every civ is OP only balances out if every player uses the OPness of their civ. This might be true in multiplayer, but certainly is not against the AI as we have it. I actually wonder how decent the AI would be in a game where all civs were identical without bonuses.