I think this must be a publicity stunt, much like the Amazon one. The technology development costs, staff training, maintenance of the drones and regulatory issues of flying them in an airport environment are very likely no match for the simplicity of sending a guy up on a cherry picker when needed (ie not that often). Specially given that easyjet's maintenance is subcontracted anyway.
As for the tough pads.... A computer pretending to be a piece of paper. Why?