Hm, I'm going to have to look it up. I really think you're remembering wrong. No offense. XD
Starting at 4:23.
What makes the scene particularly humorous is that in the Japanese script, Squall says roughly, after realizing Ansem's password is lost due to Ansem already being defeated by Sora, that trying to recover it is like "grasping at a cloud."
....Which then prompts Tifa to suddenly appear and say, "grasping a what now?"
The English script removes the pun and instead has her just casually discover them in the secret room. But I mention the scene because both Sora and Squall hear her words and turn towards her. Furthermore, Squall doesn't seem surprised at all. So clearly she's been seen before hanging around the castle.
Thats the only other person who acknowledges Tifa's presence.
She's still literally the only non-keyblade entourage human in the game to have some sort of emotionally supportive role for Cloud. And not for nothing, he shows enough concern for her to bother explaining his intentions in disappearing, as well as offers a promise to return.
To conclude this is all a one-sided irrelevance is, I think, a disservice to the characters, and not much better than arguments in ye olden days that SE's intent with Tifa in FFVII and the Compilation is that of a pathetic, clingy piner.
It's not to say Aerith's side is
irrelevant, it's that she has a different role in her adjacency to Cloud here. One that's not as tied to the hip or his literal heart as Tifa's portrayal and placement in the story.
I mean, Tifa is
literally given the role as a manifestation of his heart's light. A somewhat on the nose metaphor towards AC and how Tifa was Cloud's light of hope towards the future and family. Tifa, Denzel and Marlene were the happiness Cloud was afraid to be near because of his past and painful memories. And just like he ran from Tifa in KH, he ran from his family and was depressed while wallowing in the past.
Yes, Aerith clearly is the only person in Radiant Garden Cloud seems to care about and have any meaningful dialogue and deep conversation with. But Nomura made a clear metaphorical choice in Tifa's depiction here. Aerith's role has a parallel to her role in AC too, except it's not as properly executed given the brevity of the scene with no follow up. Aerith was encouraging Cloud to not give up or forget about his future and happiness. To not be saddled with guilt or obsession with the past.
Also, I think another issue is Aerith isn't dead either. Whatever past trauma or tragedy Cloud wants to get revenge on Sephiroth for in KH, is different than in VII/AC. Birth by Sleep heavily implies it could be connected to Zack. But at this rate, who knows...
It starts around 3:30 in this:
....LOL, oh wow....They totally just did that. Huh.
I mean..Yeah, you're right. They totally did throw a nod to a Cloud and Aerith pairing there in that montage placement. Square loves to tug at that heartstring and make nods to that pairing on one hand but then totally go and throw fuel on the fire for Zack/Aerith and Cloud/Tifa somewhere else.
I believe they're fully aware that some fans prefer seeing one and others prefer the other. And they make a point to tease both every so often.