I am a great cincher who has learned to mitigate tall obstructions but to be honest even it it cinched up partially it would have been better than this out come. Remember if the limb snaps gravity would tighten the loop. If he only was relying on one limb, my guess is it was the first so likely the obstruction clause would not be plausible ehh? The bottom line is, something was done improper, likely trying to meet expectations placed on management production requirements. Moss many times I have seen no suitable multi- limb set up I took the necessary precautions or my 27 year accident free record would not be. I know you enjoy climbing but I have built my life on it.
Just to confirm, this company only does residential/commercial work, no utility clearance work. Having watched their crews from time to time, they don't appear to have a lot of production pressure on them.