A pretty consistent problem with drones is stewardship. A police force or roofing company or rescue service will buy a drone and it will sit in a closet until they need it. Rarely are considerations made for maintenance. This week alone I've had 3 Mavic Pro batteries and 3 Inspire 1 batteries brought to me; "Can you fix these?" "Sorry...no...I can't. They sat in a closet for 1.5 years. You get what you get."
This multiplies when you have a gas engine. Drone stewardship is a hands-on responsibility. Drones must be used regularly (I personally recommend twice a month minimal), and batteries must be stored and discharged correctly (0% every 10 flights). NOBODY does this. So I can imagine this gas-powered drone (2-stroke, I imagine) will have old gas sitting in the tank for months on end. Or batteries stored with 100% capacity because the on-board generator keeps them charged.
All that said, this seems like an awesome drone. Let's see if it actually gets built.
D