It's the only practical solution really.

Cranes - Likely on a barge, on a relatively narrow canal. That's quite precarious. And make that two for both sides (canal is impassable).

Heavy lift helicopters - Even the few multiple automated cranes capable of handling a ship this size take days to unload it. Also these helicopters are quite expensive to operate.

Floatation devices - See Costa Concordia salvage operations. Lots of consideration for structural stress. Lots of mounting points on the ship. Lots of actual engineering needed for the floatation devices themselves.