Seems odd to make a purpose-specific drone like this. The modular ones give much larger breadth, especially when you are constrained to being underground, etc.
It also seems suitable as a general purpose cargo delivery UAV for military purposes. Likely its utility is somewhat limited by endurance and range with current battery tech. As I recall from when I first saw that design about 1.5 years ago they're marketing the same thing for many purposes. It just happens to be large enough to theoretically carry one man on a litter.