Despite Barcelona's dismal record against Bayern, I'm still very wary about their chances this season. However, I hope they don't approach the game with a revenge mindset as that could lead to more losing matches. If they are focusing on the game itself, rather than proving a point, we might see improvement. Hansi Flick's guidance could be the boost they need. Nevertheless, it's just a game, and we can't put too much hope into it, but I'm eager to see how they'll perform this season
If they eventually have the upper hand at the beginning of the game and they have the chance to put in more goals before the time runs out then they might want to consider taking a revenge game on Bayern , so far they can maintain their position then going for it shouldn't be bad actually.
However, I don't think Hansi Flick will want a revenge game though he might want as many as possible goals but taking it to a revenge plan... he absolutely won't do that even if they have the chance to proof that
and that's if its possible in the first place, Barcelona has some serious game ahead apart from UCL so securing the win might just be their target.