Not at all; just pointing out that he has struggled with Gladbach. So even though Pep is a better coach than Pellegrini, it should surprise no one if he gets worse results against BMG than Pellegrini did...given that that's exactly what has happened lately, even though Pep had a much stronger team at his disposal.
Looking at why things happened in the past isn't excuse making. Exhaustion is a real issue for teams not dripping in oil money, especially when injury crises occur during very busy stretches of the seaason. I recently re-watched that match at the etihad; and Gladbach were confidently out playing Citeh for over an hour in that match before their legs gave out (most visible with Mo Dahoud) and citeh was able to turn around Gladbach's 2-1 lead in the final 11 minutes...aka when the english fans finally started singing...
So they can be confident if they just look up last season's results, but if they watched the matches or remember being in that stadium during that match, they shouldn't be. Not with the way those two matches actually played out or with Pep's struggles against a BMG side; who are stronger than they were while taking 8 of 12 points off of Pep's Bayern.