HFinn,
I do not want to enter an argument, but here is my rationale:
1) rwy length is 2,900 m
2) calculations @ 70KT or 80 KT fuel load lead to a bit more than 2,900 m (including safety margin to break)
3) furthermore, v1 being a theoretical calculation, there is no guarantee that it will be reached at the calculated distance.
Based on the above--and assuming I am not making a big mistake--it looks to me there was no real safety margin.