I do believe we are talking about deep fake on the Trump video - it seems like a manipulated video tome, but that's not really the point I want to make. What just occurred to me is much more sinister.
My theory is that deep fake is how they are going to prop up Biden. Think about it. They can post videos of him speaking - saying ANYTHING they want him to say. He doesn't even have to be coherent for the next 4 years. They can hide him in a closet and push out a video from time to time, saying he's afraid of Covid, so that's why he's not seen out in public.
For anyone other than OP who wants to brush up on fake video detection.
"Captain Disillusion" has a youtube channel that is a good place to start. Popular online fake viral videos are debunked and along the way you will pick up skills and can eventually spot garbage yourself. The channel has about a 100 videos, over the last 13 years, some are better than others. Most have a run time in the 10 minute range, with one longer talk about 45m that includes debunks from his other videos.
The CD channel is on youtube, that's the way it is. Sometimes you have to get your information where you can find it.
https://www.youtube.com/c/CaptainDisillusion/videos