I think he is trying to say this is the way it is and implies that this is where it is going. I do not buy it. This may just be a run up. We have not seen major powers engage and I hope we do not. I also do not agree with his characterization of the Russia Ukraine conflict.
Drones are important sure. I am not sure how important. It is no surprise that Ukraine cannot do large scale combined arms maneuver warfare though. Neither Ukraine or Russia is trained in that and Ukraine does not have conventional air support to a large extent. I would not attribute it entirely to drones.