According to this, anyway.
Personally, I think it’s just a load of … apophenia. The author of this article is reading a bit too much into a mediocre (this is me, being hugely cynical) video game – I assume they needed some contrivance to get Aerith to join your party, while the minigame is just a case of “hay, lets put a minigame heer!” – and reading way too much into a bad movie (I cannot imagine that the creators of Advent Children put more thought into it than “Hmm, we need Cloud to be less effective so he’ll have to run away … Oh, I know, let’s have Aerith randomly appear and distract him! That’ll be cool!” and “Then Cloud uses Omnislash II and beats Sephiroth! It’ll be AWESOME! And look even less realistic than the ridiculously-low-resolution model in the original FF7! Gimme more sugar!”).
EDIT: Also the “Assume, for a moment, that everything you know about Aerith is false” bit. In other words: “Forget everything that points away from my theory. Look only at that which seems to support it.”
