For the first time in 10 years, Borussia Dortmund were able to take all three points in a Der Klassiker game that was played at the famous Allianz Arena and the statement of Bayern Munich manager at full time simply suggests that he's already conceded defeat in his club's battle to win the the German Bundesliga title for the 12th time in a row.
I was actually impressed with the performance borussia Dortmund did put up in the battle against Bayern Munich in the yesterday's fixture as this is like you did stated once in a very long time victory for them because they have not been able to record such victory in a very long time against Bayern Munich and generally this season Bayern Munich hasn't been consistent so they seem to be loosing a few games.
If borussia is able to keep up with a few more wins, they will soon get to the third position on the table as they currently are at the fourth. Dortmund isn't a team thst is characterized with weakness but they have been unable to gain victory over Bayern Munich in a very long time and it has actually been broken after yesterday's game and than I see that Dortmund has in their last five matches lost only one game and has won all other four which is also similar to Bayern Munich, for me that's some show of strength from Dortmund a d so they weren't to be seen as weak.
If Bayern Munich had won they would have been at 63 points which means they would be ten points away from Bayer Leverkusen but then since they lost, they are currently at 60 points which keeps them 13 points away from Leverkusen so it's not out of place if their coach is accepting the fact that they may not be able to win the league title this season because the gap is to much a gap to be able to really meet up.