No offence but if you think Dortmund have any say in where he is going, you do not understand this transfer.
The only sweeteners worth throwing are to the Haaland family and Mino.
If indeed this clause kicks in in January. Which I'm not convinced, personally. It was claimed by one paper only, and feels a bit of a reach. An assumption based on the fact he moved in January.
Imo, if it did kick in in January, no way Dortmund would have been stubborn about not selling this summer, or demanded the figures they did.