Exact same method as the recent influx of advertising for video editing tools with facial mimicking capabilities. There's been 1000's of vids recently (Obama was involved in one) uploaded.
They do this as a preemptive measure to make a disavowing of video evidence seem reasonable/pallatable to the general public when it is released in the future.
Watch. When video comes out of horrible things done by the powerful, they will point to these video editing tools. They will die on that hill.