In this case, the body is being entirely ignored by the autoencoder. The way it works is by first doing a machine vision pass to isolate just faces and process on that region for both sets of source imagery.
Uh.. That's what a DeepFake is? Look up the definition.
> Deepfakes (a portmanteau of "deep learning" and "fake"[1]) are media that take a person in an existing image or video and replace them with someone else's likeness using artificial neural networks.
"Likeness" refers to appearance in general, not just the face.
Still, what's remarkable is that a neophyte like me can create fairly convincing video so quickly and for so little money. And there's every reason to think deepfake technology will continue to get better, faster, and cheaper in the coming years."
https://www.youtube.com/watch?v=bPhUhypV27w