Seems you're just making guesting work here, what shows that manchester united is not in a good form this season? Can you compare thier performance this season and that of last season?
Last season, their first 3 games resulted in 1 win and 2 losses[1]. If you compare it to the current form, I guess you could say the 25/26 is slightly better by 1 point. But if you include games other than EPL, you could argue that Manchester United started badly, considering they exited the Carabao Cup, CMIIW.
At the end of the day, it's only 3 games. Let's see their position on the table after 10 games to predict where they'll end up next year.
[1]
https://en.wikipedia.org/wiki/2024%E2%80%9325_Manchester_United_F.C._season