Exactly, so the point is that any relevant gestures must be coming from the timing used in an existing video, the current deepfake tech can manipulate lips and

Exactly, so the point is that any relevant gestures must be coming from the timing used in an existing video, the current deepfake tech can manipulate lips and facial expressions, but it can't have the video lift three fingers at the proper time when "300" is being said. So this is either an indication of a very elaborate deepfake which managed to surface an amazingly coincidental source video (which should be possible to find on her archives) or that it's not a deepfake but a real recording.