Somebody who is primarily a piano player will tend to understand „live“ in a strict way, so even using a style would mean that it‘s not 100% live even though he does a lot with the hands. If we focus purely on the arranger segment, I guess „live“ would accept using styles, but not midi files. Moreover, I think a self-made midi file is to be judged completely differently from using a third-party midi file, even if both is not live.
So I guess the term „live“ alone is not helpful, I prefer a more detailed description of what percentage is handmade and how active both hands are playing - maybe even feet, all the better...