To me, i see the Haaland situation as Dortmund refusing to sell up 2 core squad members in the same summer; it is not about the money involved, or the release clause in Haaland contract. It is about keeping the Dortmund squad competitive ahead of a new season.
On the other hand, the Player himself has shown no signs of wanting to leave, and ofcourse not to London. Dortmund would earn huge bucks from Haaland departure; either this summer or next summer