Similar to this site, does Wolfram have some capacity to generate "fake humans" (for a cool demonstration)?
Mathematica has full capacity to build complex neural network, GANs included. However, if the NN isn't in the Wolfram's repository of pre-trained models, you will need to build and train it yourself. And for this you need data, time and knowledge how to do it.
In other words, Mathematica can generate human faces in theory, but to make it possible one is likely to do a lot of work.