It's quite a big goal difference, even from the start I was convinced the worst result was a draw. It seems that Tuchel's statement is correct, if Bayern's players take the match too easily. This resulted in their mental breakdown when the opponent made 2 goals. This saw the first half they lost by 3 goals. Even Frankfrut took the initiative to attack, they seemed to deliberately shock Munich by pressing above, so that Munich was not free to control the ball.
I still can't believe Bayern Munich lost, especially with such a huge goal difference. Maybe if the defeat was only 1-0 or 2-0 it would still make sense, but for me this defeat doesn't make sense. what really happened to Bayern Munich? We know Bayern Munich should be able to win this match to overtake Leverkusen in first place.
It's still hard to believe when you see the match score. Maybe I also agree with what you said that Frankfurt succeeded in breaking down the mentality of the Bayern Munich players when there were two goals, they really took advantage of the moment so that Frankfurt really destroyed Bayern Munich in this match with a score of 5-1.
On the other hand, I see Dortmund this season as less serious than last season, if they play like this I'm sure they will play in the Europa League or conference league next season.