The consensus is that it was an accident, right?
Yes. However, he was using a running powerbomb which is not a very safe move in any regards. It akin to those adults who think they can play on the kids Slip-N-Slide. And they run and throw themselves belly first on the ground only to have their adult weight basically pin them to the ground, but the momentum and kinetic chain of energy travels up their torso and fucks their neck and spine.
D'Lo basically spiked Droz into the mat where his entire bodyweight and the force behind it compressing into one landing point and that was it.
It was probably 100% an accident, with neither to blame, but if the running power bomb had been banned, it wouldn't have happened.