Yuu might be there though because there was a confession right when the present him woke up, also he didn't die. He might be going back to a pleasant surprise (≧∀≦) then Yuu will have to explain what happened
Yuu can't be there he was already dead in that timeline . Imagine someone who died years ago popping out of the blue and saying i was brought back to life from the past because someone traveled from the future and saved me. These are parallel timelines even if yuu was saved in a timeline only means that he's gonna continue living in the new future but not in the future that belonged to another different past in which he was supposed to die. ( a change in the past so a change the future so they are not going to meet his future is not the same as 'that minato") Parallel timelines co-exist together which means while we are living now the people from other times be it the future or the past us are living too in a parallel universe so what you stated is clearly impossible.
I hope you can understand i'm sorry i'm just a sucker for science fiction so it can't be helped lol
Somewhat it's sad since the old Minato who came from the future doesn't exist anymore (he's 66 or 68 years old??? 16+50 or 18+50) but he changed his future where he can live happily with Yu. We can feel he was very lonely and desperate.
Oups somewhere
I feel so sorry for the future minato now he's goung back to his timeline where his yuu is not there .