1. He correctly recognizes it as very important and different in nature to other smaller CCAs from around the world
2. He reckons due to it having a rhomboidal wing without canard or wing tip devices that it's optimized for speed and not agility
3. He misidentifies the engine as WS-15 due to serrated petals, not realizing/forgetting that WS-10C has them too
4. He guesses from DSI intake that the aircraft is optimized at around transonic speed
5. He recognizes they can of course act as CCAs, but their larger size and evidentially capacity for electronics inside means they could also operate in a different mode. He guesses either full autonomous fighter or remote control fighter, he's leaning towards full autonomous fighter.
My opinions are I'm not sure why DSI would indicate optimized for transonic speed given J-20 has DSI intake and can reach Mach 2. I take Xiyazhou's argument that these UADFs can be thought of as a JF-17 sized aircraft fitted with J-10's engine, which should mean excellent thrust to weight ratio. Without the drag from a cockpit these things should be pretty fast as far as top speed go.
I wonder what kind of thrust to weight ratio an aircraft of that size would have if fitted with a WS-15, must be some scary number.