The experience of winning the title is very important for them so that they are always consistent in every match. Frankfurt has had a good season finishing the way they have even though their hopes of winning are far from expected.
The Bundesliga has many strong competing teams such as Munich, Stuttgart and Leverkusen, they also appear very aggressive, no one can determine the champion in the season, at least they have given their best and can move up the rankings in the Bundesliga standings.
If not for the draw in the last game with Augsburg, Frankfurt would have been four points the Bayern Munich. But they had to struggle to get that home draw. You forgot to mention clubs like RB Leipzig and Wolfsburg who are not also doing sadly so far. The Bundesliga title is still open because there are still many games to play and some averagely rated clubs are coming up with exceptional performance. Frankfurt has become the German Champions in the 1958/59 season and has not won it again since then. Winning the Bundesliga will be an uncommon achievement.
Better you also said it will be an uncommon achievement for them. Even though we know that there is still a lot of game to play in the Bundesliga, I don’t think I will have a hope to say that Frankfurt will have a chance to be champions this season knowing well that Bayern Munich has taken it upon themselves that they will surely take that title this season without any doubt, because we all have been seeing it in their performance.
I know Bayern Munich has played 3 draw games, but still, out of 13 games, they have still not been defeated by any other team yet. So to me, for someone to believe or even have hope that another team will be able to get the championship title of the Bundesliga this season apart from Bayern Munich, then I think he is just saying what wouldn't be possible. Although there are miracles and luck, anything can happen.