Fonsini
It certainly looks like an honest question to me. I haven't read the full report yet but aside from RoD there are other parameters that must be considered. Rate of roll is probably relevant in this case.
Assuming they ejected at less than 90 AOB (it would obviously be a problem to eject from such a low altitude with more than that) then you must consider the flight parameters. When the seat leaves the aircraft it is imparted with a vector from the aircraft it has just left. For instance (not in this case) but a large RoD needs to be mitigated against by ejecting far earlier than in S&L flight. If the jet was rolling rapidly towards the ground this vector would be applied to the seat with tragic consequences. The differing angle of ejection for front seat and rear seat can also play a part (like in the Navy T8 accident involving Jack London) although in this case since they both died that would appear to not be the case.
Hope that makes sense.
BV