Well this article is full of semi-inaccuracies. Big if true, but I'm having some doubts based on what is in that article. I hope they succeed with this.
For example they say that the quadcopter performed multiple flight-charge-flight cycles with no mention at all of what those cycles consisted of performance or time wise. 5 seconds of flight 10 minutes of charge would be pretty useless.
The state of charge graph makes it look like 22min of charging for around 1min flight time. (Pretty rough estimates since the chart doesn't have grid lines.)
So the title is rather misleading as technically any tiny array of cells strapped to a quadcopter could eventually charge it enough for a flight.
The development is cool though. Those are very light weight cells, but can we please chill with the clickbait.
Yes I assumed it meant they could fly continuously.
Sometimes it's the little things that are the most revolutionary. Small drones the size of the human hand that are essentially endlessly self-powered could have countless uses. Perhaps many we can't even see yet. Terrain exploration, security, warfare - there are many ways you would see these being used.