This was not a rehersal or routine flight This happened during an Air Show performance.
During Air Shows everything is pre planned, Altitude, speed, exact points for turns and manuvers etc.
So, the experts who are saying, Pilot attempted a manouver too low or at a wrong time or whatever, they are missing the point that it was an actual performance, there was nothing for the pilot to choose and decide, he was doing pre practiced and planned manouvers. keep in mind other Fighters taxing, taking off etc.
Quick nose dive fall is clear and shows no engine power to allow pilot to do anything.
My POV only, not saying I cant be wrong. But to me its very clear.