The aircraft in question was apparently not equipped with GPS so it could not do a RNAV (GNSS) approach to LPV minimums.
They would have used the LOC or LOC/DME approach (with no G/S) to RWY 05.
They landed about 1100' short of the runway, most likely clipping the electrical wires, thus the subsequent power failure at the airport and surrounding area. Then the hit the ILS antenna/array and continued to slide along the runway. The gears came off at the first impact point and one of the engines ripped off at some point too.
With those winds I wonder why RWY 32 was not used perhaps because of its snowy/icy condition.
The initial press conference from Canadian TSB...
Air Canada AC624 touched down 335 metres short of runway, TSB says - Nova Scotia - CBC News