If Azzarello's run was about identity with Wonder Woman then he sure had a unique way of showing it. There were many times where it seemed like Diana was having an identity crisis, and flip-flopped on how she defines herself, or what name she responds to.
After she learned her birth was a lie, she didn't see herself as "Diana" or the "daughter of Zeus", but she declared "I am Wonder Woman!"
Other times when people referred to her as Wonder Woman, she would say, "No, I'm Diana. Call me Diana". Then she goes through other series of revaluations of her identity, and now seems to accept them all, "I'm Diana, daughter of Zeus and Hippolyta, and God of War!" But all those other things are just titles...So, by the end of it, I'm not sure what he was trying to say about her identity.
I guess he was trying to say that despite her background, or what mantle she occupies, or what others call her, she ultimately defines herself by what she does.
But still, if the new title wasn't going to have any significant impact on her development as a character, I don't see why it was added in the first place.
I vote for a retcon.