Why not because in the end for now Manchester City's condition is also still in trouble so that Manchester United can get the momentum at this time with a few notes that must be considered.
Chances of 3 points are still very much there for Manchester United even though it cannot be denied that in terms of probability and mentality conditions Manchester City will clearly be superior for now but they can also take advantage of the opportunity in Manchester City's condition which is not too erratic in terms of performance for now let alone in terms of scoring goals.
Manchester City's attacking line sometimes struggles to convert opportunities especially when Haaland is tightly guarded. But the problem is whether Manchester United can because in the end if they really want 3 points some mistakes in the defense area just like they did when facing Victoria Plzen in the Europa League should be more concerned so that they can take advantage of every momentum including taking 3 points at Manchester City.
I do agree that United has a chance, doesn't mean that they will win, it's just talking about the possibility and if we are talking about just the possibility then I would say that United of course has a chance.
This chance doesn't come from United being any good, they are not good at all but it comes from City being quite terrible these days, one win in ten games that's not normal and I would say that when you are that bad and lost or drawn against much worse teams, then United could be another low level bad team they lose to, that could be possible and could happen as well. Otherwise, United sucks too, if they were facing someone other than City, I would say United will lose, but City is just doing too bad these days that's why I have no hope for them.