Quadcopters are in the lower tier of all drone types. Fixed-wing drones are more suited to military applications due to greater range and payload capacity, not to mention speed.
Who says the only use case the military has is to carry weapons and/or perform remote surveillance? Just as plausible they’d use them to survey military owned buildings looking for structural defects, promotional videos of military life, or any other use case that a normal commercial user of DJI products might have.
There are too many different "military applications" to say that. For sending a drone into a building with possible enemy soldiers, a rotary-wing is definitely better than a fixed-wing.
Fixed wing drones require missions, procurement, permissions etc. rotor drones give you plenty of airborn vantage and photography ability for next to no money and minimal risk.
The VTOL and hovering capabilities are very useful platoon-level tactical capabilities. Typical usage example from Donbass war - the first 30 sec. of https://www.youtube.com/watch?v=MHo7x2Vcjjg
Highly maneuverable portable drones are going to be a key part of urban conflict in the next century of the ongoing war in the middle east, just as the RPG and IED have been.