First, I do not believe we truly know what caused the break between Gjert and the brothers.
However, I think it is pretty clear that Jakob has made an ultimatum to the Norwegian track and field federation - he has stated that he will forego any appearances in all championships if the federation cannot guarantee that Gjert will not get accreditation as a coach for Narve or other athletes.
Jakob has proved his strong mentality, and the threat is credible. Jakob would probably be happy enough running Diamond league, and the Norwegian federation needs Jakob more than he needs them or the championships. Therefore the track and field federation has caved to Jakob’s demand. The whole situation is unsolvable without concessions from Jakob and the brothers and that is not happening.
Further, I find Norwegian sports journalists a weak bunch for just skidding around the matter and not seeking real clarification.