Yes that's right. If explored further, Bayern Munich's problems began when Julian Nagelsmann was fired from the Bayern Munich coaching chair and this was truly surprising. because previously there was no news that said he had problems at Bayern Munich. Even though Nagelsmann is a great young coach with creative tactics in every match, even his dismissal when Bayern Munich was playing well.
So it's not surprising that when Tuchel coached Bayern Munich it wasn't optimal because it seemed too forced, making it difficult to get chemistry with the players. Which ultimately made Bayern Munich end the season without a trophy and led to Tuchel's dismissal. With the presence of a new coach, Kompany, I hope Bayern Munich learns from these mistakes by not interfering with the coach's decisions and giving Kompany time to build a strong squad for Bayern Munich. Next season the Bundesliga will be very competitive because Xavi Alanso finally stays at Leverkusen. Of course Leverkusen will remain the strong team they have been this season.
Every team has its glory days and like Bayern Munich is currently in decline because of the mistakes it made in the past, and what you said is true that the first mistake made by Bayern Munich management was when they fired Nagelsmann.
A tough task awaits Kompany because the Bundesliga is currently very competitive with the rise of several teams, especially Leverkusen, which is making it increasingly difficult for Bayern Muncih to dominate the Bundesliga like it did in the past.
To be honest, I have a little doubt about Kompany because he doesn't have experience, especially now that Bayern is in a slump, of course it will be a little difficult to get this team back up.
Bayern Munich's mistakes are obvious and those mistakes may be why their team performance is so poor right now. Bayern munich changes manager and it is very common for them but this manager change has a bad effect on their club's performance which Bayern munich may not realize till now. Kompany may take charge of Bayern Munich again but how well he will do for the team is still a big question. But Bayern Munich must have faith in this manager and must give this manager time to fully implement his strategy and internalize his tactics. When the players understand a manager's strategy well, it will be seen that each player is doing well in his position, thus the team performance will be better and the team will have a chance to do well in the big tournaments.