It was real life, not loss time.
[ol]1. Aiba only said "but you've stayed the same" in reply to Shinomiya saying "you've grown taller," not "you've grown older." If you're in a comatose state, your body still grows older but you'd be malnourished and physically weak; her body probably kept all the nutrients for keeping her alive and not too much on height development lol[/ol]
[ol]2. She woke up hearing phss phss sounds, which I am assuming are ambient hospital sounds? That wouldn't happen if everything was frozen.[/ol]
[ol]3. She touched his hand and said that it was warm. This is different from the first chapter, when she put her hand on his face in loss time and he said that it was cold, even though she said she was warm earlier.[/ol]
[ol]4. "welcome home" is an odd thing to say if she's not truly alive and awake. Loss time was result of her stress, and the ideal was for it to shorten in duration and eventually disappear so that she can fully live in the real world. I don't think Aiba wants Shinomiya to only exist in the loss time world, but it would be better than nothing, so I think he would have said "welcome back" if she were still in loss time.[/ol]
[ol]5. the last page had a breeze blowing on the curtains. Given this artist's attention to detail, I don't think that's just an aesthetic, but rather a clue, like the spinning top in Inception.[/ol]
[ol]6. as someone said earlier, I think the last line refers to "loss time" not as the time-stop phenomenon they were using the term for, but rather the original meaning they were discussing in chapter 1, also known as additional time or overtime.[/ol]
[ol]7. it has to be the real world because I need them to get married, have 10 puppies, and live happily ever after 😭[/ol]