I don't think this will be good for Victor Osimhen's career, on the one hand we see that Manchester United really needs a striker like Victor Osimhen to help the team score many goals but I doubt that Victor Osimhen will agree because Man United's team performance has been very unpromising in the last few seasons so it will not make Victor Osimhen's career better and on the other hand we also have to consider the ability of the Man United team with Victor Osimhen's high salary desires.
This is still just a rumor and I am more sure that Victor Osimhen will go to the Saudi Arabian team because so far the rumor is very strong especially Victor Osimhen is offered a very high salary so it is difficult to refuse.
That is a do or die type of situation. If Osimhen goes to United, there are two possibilities, either he will play great and he will be considered one of the greats and score 25+ goals a year there and be their god and they will worship him. Or he will do terrible and he will never be at a level of being a high regarded player.
This is why it is quite simple that if he ever decides to go to United, he is not going to be in the grey area, there is no way he would be considered "alright decent player" anymore, either he will be loved and worshipped, or he will be seen as terrible. Hojlund right now is seen as "bad", back when he was in Italy, that dude was awesome. So you have to see, it is not that easy for anyone to be this great at United.