But an AI does anything but average out, else we wouldn't be any more advanced than the earliest mathematicians.
Its skill comes from being able to have millions to billions of parameters if required, and then contain data within them all.
It doesn't seem entirely unreasonable that it could use those (riding off our suprisingly good math skills) and create a model that represents a human with low enough noise we wouldn't even notice.
(but also I'm in a similar more chemically focused field, nanotechnology so I have experience with nanoscopic-microscopic structures, and what can we artificially build from them while not killing the biological side of things)