That is a pretty good "deep fake" for someone in their spare time (I presume it was their spare time). Just think what a large sophisticated organisation with a lot of resources or a government agency could do.
However I don't think the thing to worry about is that significant people could be shown doing or saying something that they didn't. I think the fact that they can get plausible deniability for something they actually did do and get away with anything where there wasn't more than a few witnesses is more worrying.
It's all fake news > it's just a deep fake.