I guess he was aware of that , when it will be not running good that his job is in danger.
Also i dont agree with you on the case when he will be win the german league at his first year , if that would be happen its a very good achievement for him and the Club.
About the Champions League and winning it why should it not be possible ?
Winning the league is realistic, I think the Munich management gives a target according to the team's condition. Kompany has been given enough funds, he is given space to choose players according to his wishes. They should be able to learn from last year's mistakes. Management also has to be wise with the coach, I think the change of coach with a short term is also bad.
As for UCL Munich, they are an experienced team, so I think they are able to compete. But the current condition I am quite doubtful that they are able to win UCL Trophy this season.
I personally won't expect too much about Bayern Munich under Kompany because for me, if Kompany can make Bayern Munich in the top four it is also good enough, considering there are many doubts about Kompany too. Indeed, so far Bayern Munich also still looks fine but anyway, Bayern Munich also still hasn't met or played against other top teams in the Bundesliga. That way, I think there is still no guarantee whether Kompany will be able to make Bayern Munich consistent or not throughout this season.
Therefore, I personally will not predict too quickly about whether Bayern Munich will get the trophy or not this season. Because about Bayern Munich, with the doubts that exist in the Bundesliga then of course, predicting Bayern Munich for the results in the Champions League I think it is still too far away and too early to predict.