Well they have this thing called deepfake porn now where an AI stictches the face of an actress onto the face of a porn star in a porn movie, and it looks pretty good - and this is just amateurs doing it. A state level organization, with professional artists going over the video frame by frame could, with no doubt in my mind, perfectly replicate Assange.

Pay attention to Assanges blinking pattern in his newer videos. The one thing these fake face algorithms are completely unable to duplicate (the math is insanely hard) is the random natural blinking patterns of people. Assanges blinking patterns in his recent videos is very wonky and unnatural. Either it's an AI that can't hack it, or he's using blinks to send a message on MSM channels. Morse code but with a rotating cypher encryption (Assange got his start in encryption)