In my mind, I’ve tabled how I feel about this last segment as a whole until I have the full picture. I get what they’re aiming for, and I think I know why they felt the need to sledgehammer the point, but I cant say if it’ll stand the test of time.It's partly meta, but it's also definitely there to reinforce that Cloud is not right for Aerith, and deep down she knows it. We have it confirmed that Dream Aerith is not Our Aerith, so it's likely it's the Aerith who was piggybacking with Our Aerith in Remake, OG Aerith. She's giving herself a one last "what if" to sort her feelings out.
This is us seeing Aerith learning not only that she hasn't moved on, but cannot move on with Cloud. He's not what she wants or needs. Zack is. That's why this is a Zack segment in the internal logic of the game, it's furthering his narrative, not Cloud's It's handing Cloud a MacGuffin, and setting Aerith up to come to the conclusion that not only did she always love Zack, she never loved Cloud and he never loved her, even though they do like each other.
I believe this is the Remake Resolution Aerith. She knew there was no chance of a happy ending, so she was warning Cloud not to fall in love with her, but even then she was talking to herself more than Cloud without realizing it. This is the next step in her journey back to Zack.
This is also part of it.
Also, remember that Other Marlene's full line is that "She likes Cloud because you weren't there." I am pretty sure this is meant very literally. in that "She will like Cloud only in the absence of Zack."
A couple of things need to happen in part 3 to steer it in a better direction for me, personally, but for now I’m going to say I don’t know how to feel about it all.
Same for her death sequence. I get it, but guys you are dancing on a very fine line and I hope you know what you’re doing.