As this stage it looks like Dortmund should have invested more. But the season has only just begun and a lot can still happen.
In any case, they made some money again today. Thorgan Hazard has moved to Anderlecht. He had been with Dortmund since July 2019. But Dortmund have not been interested in him for a long time so the transfer is understandable.
Edin Terzic understands the logical system of the club, he's been a longterm coach and understands specifically how the team operates. Borrusia Dortmund is lucky in such a way that they have talented players from there academy who will deliver the club interms of difficult times. Borrusia Dortmund have no issues with players, they only selects the best players and triggered their sell clause before anyone would even notice, there potential player is already on the market. They have no interest in restructuring there club into a winning team, title contender just as Bayern Munich.