The scenario for determining to qualify for the Champions League in this way will not benefit Dortmund even though they still have a chance. Frankfurt, Freiburg and Dortmund will fight to get a ticket to the Champions League which is determined in the last match. Dortmund will not be too difficult in this match because they will face Kiel as the bottom of the relegation zone. A big win needs to be achieved by Dortmund because if Frankfurt's match against Freiburg ends in a draw it will benefit them.
Dortmund will do everything possible to win this match their match against Holstein Kiel so that they can qualify for next season’s Champions League. Holstein Kiel may try to give Dortmund a tough time, but I can't say they can stop Dortmund from winning this upcoming match.
Holstein Kiel won the match in their first-leg meeting, which they hosted. However, today, Dortmund will host the game. With Dortmund’s current situation and their determination to qualify for next season’s Champions League, hosting the game could be an advantage.
In fact, it is possible Dortmund will find the game relatively easy, even if Holstein Kiel puts in extra effort, because Dortmund are currently in great form. At this moment, I don't think Holstein Kiel are capable of stopping Dortmund. But let’s see what happens, as football is full of surprises.