That's only the start, while some algorithms are getting better at creating fakes, you also need to recreate the voice.    But there would be so much to notice; still video, plain background, and as still a head as possible is the ideal.    Next this isn't something you can do with your home computer, this is a process that takes many hours of cloud server time.  So, theres likely to be transaction records.    There are literally in the hundreds of people in the world that understand AI systems sufficiently to recreate these things.    The best systems to recognize these deep fakes happen to be the deepfake AI.