I’m pretty sure this is a deep fake, but what makes it powerful is that it is actually believable. Like if you saw one of Trump In a similar circumstance, you would know it was fake outright. But the fact that you have to take a second look with this one and in some cases, many people will just outright believe it makes it hilarious and damaging.
He was never that slim.... relatively speaking.
Now if there was a video of him out in the woods, with someone shouting “squeal like a pig”, that would be totally believable.