Kompany did manage to bring Burnley's promotion to the EPL but on the other hand in the end he also brought Burnley relegated which means there is a condition that must be a concern where he will still be very difficult for major competitions.

It's just that in this case he also still has a chance where we must realize that in the end being at a small club like Burnley with minimal resources is clearly different compared to Bayern and all its luxuries.
Still doubts will remain here and it is a natural thing because doubts like this always happen to every new coach but that does not mean we consider it a mistake from the start because after all we cannot consider this a mistake before seeing whether Kompany's performance is in line with expectations or not because the situation considered a failure is when Kompany does not get anything and cannot give a good performance for Bayern so he is considered a failure but at the moment we haven't even seen him play so he still cannot be said to have failed because Kompany has not shown his talent to train Bayern.