Vincent Kompany cannot be blamed for the poor performance in the Champions League this season because Bayern Munich has not performed very well in the Champions League in previous seasons as well. Vincent Kompany may not have had any experience managing a big team before, which is why many people are skeptical about his team management, but it cannot be said that he is managing the team badly. If a team does not have players who can compete in the Champions League, no matter who the manager you appoint, that team will not win the Champions League trophy. I think a company should be scrutinized for a season with financial freedom and if he can improve the club's performance with the players he wants, then that will definitely be a commendable job for the manager.
I don't expect anyone to blame Kompany for not advancing further than the level at which they were disqualified. In fact, to me, Bayern Munich's performances in the Champions League are not that poor, especially when you consider the state of Bayern Munich before Kompany took over the team. In fact, the way Kompany first focused on the domestic league and was able to win the Bundesliga is the best approach. I know the strategy. By doing that, he showed what the squad is capable of. If Kompany had decided to focus on all competitions as much, he might not have achieved the Bundesliga title and might still not have won the Champions League. There's a high chance he would have gone trophyless, and by now, some people would still be blaming him for not winning any trophy.
But as Kompany has now won the Bundesliga, even the owners of the team will believe in him and will be ready to spend to get more great players who can strengthen the team and enable them to focus more on multiple competitions, especially the Champions League. Now that Kompany has won the Bundesliga, I believe he will shift more focus to the Champions League, and Bayern Munich may do better than they did last season. If they continue like that, they might eventually win the Champions League. For now, I don't think anyone should blame Kompany in any way.