I think even in theory it doesn't make any sense, because in case they can meet in any stage of the tournament, do they need a rival? Even considering it's MU, anything could happen in the moment. Moreover, despite MU's poor performances I think they still have a chance, plus they can't lose and need to hope for a miracle to qualify.
I know nothing complex about Manchester United history but I know they did actually lifted major trophies in past decades and Sir Alex Ferguson was the man of the year with the outstanding performance. Erik Ten Hag have dismantled the ongoing excellent performance for Manchester United, look at them today. They're suffering and I doubt if they will be able to stand the heavy force upcoming their way this season. Manchester united only need a miracle to happen on that day because it's definitely not going to be an easy match for the Red Devils. But for Bayern Munich, they will become the predator and Manchester United is called the prey in the match.