What a horrible start for Onana, to think he was one of the best goalkeepers in Europe last year.
The problem of Manchester United is wholistic and not a goalkeeper fault. The Manchester United teamis not stabilised even right from preseason time. Last season that Manchester United ended 3rd in the English Premier League table, we saw that they had good preseason and after the first two matches that they performed poorly other matches were excellent.
Yes, you could say that Man United's performance hasn't really been the best. At the start of this season, Ten Hag's strategy doesn't seem to be working optimally, it can still be seen that the squad is still not very solid and consistent in competing and implementing its tactics well. Yes, Onana is a talented and good goalkeeper, I'm sure he is still good too. But what you say is true is that this is about the whole team. Even good goalkeepers won't be successful, especially if their back line isn't very strong. Ten Hag still has a lot of homework in the future to strengthen all lines so that they can compete again to become clubs in top standings.