This is deceptive, though. The "deep fake" is essentially building on the CGI de-aged product. If they'd started with deepfake it likely wouldn't have yielded this level of result.
In movies you don't usually have the luxury of choosing the original face you want to replace, but for people who make memes (or porn), you commonly choose a source video featuring someone that resembles the person you want to put in.
Hiring an actor that roughly resembles the person you're trying to deep fake seems doable.
It's an intuitive result even ignoring the specific model. It takes less information to go to and from similar faces than it does two completely dissimilar ones.