That has quite a bit of limitations for that kind of use. Data logged can vary even several meters (as I assume it's GPS based) and I don't think it can differentiate between a mine and any other shrapnel laying around. What it can do is go trough fields quickly and offer coordinates for people to go in and manually verify & clean the area so they get at least a majority of things cleaned up faster than having boots on the ground sweeping every square meter manually.

And if that kind of drone was widely used to map out routes for tanks and other equipment it would offer an option to create artificial path and bury in C4 or some other explosive in the way which is invisible to metal detector.