Either you crash or you land - there's no such thing as a crash landing. A landing implies control, in this case it appears that they had none.
If you're on an un-stabilized approach and you're so low that you hit power lines coming in and the only two obvious factors that allowed everyone to walk away is that 1. there happened to be a hard and flat surface in the aircrafts trajectory and 2. the slush and snow acted as a fire extinguisher, I'd say that this absolutely qualifies as a crash. Unless they had a major malfunction and this was the best they could do.