This strategy of Borussia Dortmund means to me that they are not aiming for the Bundesliga championship. If they really wanted to be champions, they wouldn't have sold the young and world star candidates who are in the top 11 every year. The most recent example of this was Jude Bellingham. He was also an important name in the main squad, although Dortmund sold him.
Maybe they think differently and have other strategies to get other talented players. But it's really a shame if they lose good players and their potential. But on the other hand, what if they target other players and need more money?
I don't think if they don't want the Bundesliga title, they always want it, but indeed sometimes they need more efforts for that, especially when their current rival is Bayern. Even though last season they almost got the title but lost a golden opportunity. Now this season, I'm also still doubtful because they still haven't found or there are signs of getting other key players who can really strengthen the squad.