Bayern Munich is still definitely stronger compared to Manchester United. And I don't think they are going to lose against Manchester United. And we also understand that the reason why Bayern Munich lost the match against Frankfurt was them not taking the match seriously. They tried to play the rotation players a little too much, and that was their downfall.
Bayern Munich can lose even though they are stronger than Manchester United because a strong team can lose when they are predicted to win. With Manchester United's poor game, I think the speculation that Bayern Munich is stronger than Manchester United and that it is difficult for Man United to win against Bayern Munich is more likely to happen because Bayern Munich is no longer distracted considering that they already have one ticket to advance to the next round. Just the draw received by Bayern Munich has knocked Man United out.
Bayern Munchen no longer sees the match against Man United as a very important match, because we know their position is untouchable in the standings to advance to the round of 16. However, on paper, even though Bayern lost 5-1 in their previous match against Frankfurt, they are more promising to recover, than Man United who also lost their last match to Bournemouth. I think Tuchel will use United as an outlet, by beating Ten Hag squad, then the spotlight on yesterday embarrassing defeat will automatically shift to United.
Surprises could happen, but considering, considering and looking at the head to head record between the two, Bayern deserves to be superior even though they act as the visiting team. I don't think Tuchel will rest many of his core players, he doesn't want to repeat a similar defeat tomorrow, and what is clear is that they want to maintain an unbeaten record in the group phase. Then, United would crash out of the UCL and fail to advance to the Europa League play-offs, and Ten Hag fate would hang in the balance.