Actually, it's the old discussion style versus midi file again. With a style you control at least the chord progression, it can be spontaneous, and depending on how you use styles, if they are lean you can add a lot yourself live.
I always think: how much of it would the player be able to keep if the storage or electricity would collapse and they had to do the same on a piano or guitar...
Just watching it again, actually I'd say 90% is preprogrammed, she's adding one live part of maybe 10 at a time.
It's the evolution of music and society, we are slowly becoming Borgs and can't do much about it, it's definitely even more computer-dependent than an arranger.