That should be the case because the current Mancehster United coach knows Ajax very well, so he will probably know the weak points they have. However, the problem is that Ajax is only one of many teams they will face, so they don't just focus on one team but they have to focus on many teams. In the English League alone, they have to face 17 other teams there, so they have to think about every weakness of the team they will face.
Not to mention that they will face many teams in the European League and other domestic competitions, including facing teams in the second division after the English League. A team will be very complex when talking about the opponents they will face, because it is not just against one team.
Yes, it's true that not only Ajax is a strong club that will be faced there, but there are many other strong teams. Maybe the European League is not as difficult as the Champions League. but the level of the European League is not much different from the Champions League. In fact, the tension could become stronger when several clubs from UCL participants started to arrive who failed in the UCL group stage and could only reach third place in each group in the UCL. But Man United will probably still be the favorite in the European League. they could definitely go quite far. But in the European League I prefer Italian teams. Like Roma, which always shows effective play in the European league. Even though they are no longer with Jose Mourinho, their new coach, De Rossi, has shown good results last season. So Man United also has to be prepared to face a club like Roma which cannot be underestimated even though the depth of their squad is not as good as Man United.