It's always been a C/T moment if you think about it.
Though I do need to correct you, as her saying the line about finding a girlfriend is during the early days of the nibelheim incident, and she learned of Cloud's ambitions for SOLDIER from Tifa a day or two before Cloud arrived, as that was before her meeting with the player turk in Before Crisis which was a short time before their arrival.
Am I splitting hairs? YES. Is it important to be accurate and precise? Also yes.
No, that makes sense. I suspect the idea that the lifestream creates alternate worlds of possibility that normal just drift away and fizzle or maybe create new worlds is part of the process of the life of a world.
I don't think he's creating them, just subvert them to his own end.