I don't believe that Bayern Munich will be able to remove Arsenal from the champions league this year. Arsenal is no longer that fragile team they used to be. Arteta has succeeded in transforming this team, that they are now a threat to any team they face. The game is very much balanced, Bayern is having a poor season domestically while Arsenal are having a wonderful season. This clearly makes Arsenal the favourite team to win and qualify.
I also think that Arsenal is no longer a fragile team like last season because they themselves can definitely learn from what happened to them last season so that Arsenal can improve it this season. Although I also don't consider Bayern Munich a team that has failed this season because Munich is only behind Leverkusen in its own domestic league and no other team has been able to surpass Munich so far so the meeting between Arsenal and Munich in the Champions League quarter-finals this season will be very interesting to see.
Arsenal's strength has improved a lot at the moment and this is in contrast to Bayern Munich, which has experienced a slight decline and their inability to maintain consistency this season means this match will be difficult.
Mathematically, based on what happened last season, Bayern Munich will be slightly favored in this match, but if you look at the strength, I see there is a chance for both teams to qualify for the semifinals.
Both teams Arsenal and Bayern Munich have changed a lot during these years sicne they played a game against each other for the last time. Arsenal had many weaknesses and they were not in the good form. Also, we are talking about Bayern Munich while they were in the best form and they could beat any team in the Bundesliga and even in the Champions League. Now Arsenal changed and lot and with a coach like Arteta in this team, they are motivated more than before which can help the team.
On the other hand, Bayern Munich is having hard days and they are not in the good situation in the Bundesliga which can have a negative effect on this team.