Let's say Mallory makes a video where he looks, sounds, and acts like someone (e.g. a celebrity, the president of the United States) using makeup and voice acting. In the video, he might be doing something that can harm the reputation of the celebrity/president but never claims to be that person, maybe even saying he's not that person but while sounding like a joke. He then uploads the video to the internet, making no solid claim or disclaimer about being that person in the video, title, description or anywhere.
Then Rando, a random internet dweller, sees the video, and re-uploads/shares it with a title/description saying the person in the video is the celebrity/president.
Then Walnut Street, a news outlet, sees either of the video (with or without the claims) and reports it (with a lack of validation) as "Celebrity A does X".
In this chain of event, would any of the 3 people/entities face legal trouble for impersonation and harming someone's reputation?
