I doubt that Arsenal can win this round, indeed both teams still have the same chance, but in the next match Arsenal will face Munich away, of course this will make Arsenal feel pressured and I'm not sure that even if Arsenal uses all their strength, Munich will also do the same thing, let alone competing at home will make Munich more confident to win.
In the UCL, all teams will do everything they can to win and the two teams you mentioned have also played the first leg with a draw. So for the match in the second leg, it is certain that both teams will try to be better in order to qualify for the next round and Munich, with its conditions which are different from last season, must be able to beat Arsenal, which this season is also much better than last season. Even though on the one hand, Munich may have more enthusiasm because they are playing at home, this will not guarantee that Munich can win easily.