If the Dornier is actually "buried in sand" as the article states - or even if the fuselage and wings have even a modest amount of sand washed inside them - then the sand would need to be hosed out under pressure before any lifting takes place.
To not do so, will just mean the lifting spar will merely rip straight through the aircraft structure.
The water inside the fuselage and wings adds many tonnes to the weight to be lifted - the buildup of sand would add another 50 tonnes at least to the weight to be lifted.
I hope these people understand what they're about, and don't allow shortcuts due to budgeting limits, lead to incurring a disaster in the lift.