You can tell when a painting is a painting. Even it’s photorealistic. You know a person created it and that it’s fiction. Often these are hung in galleries where people expect to see art.
Deep fakes exist to fool people into thinking someone did something(like pornography) when they didn’t…usually with the intention of causing harm to their reputation. That’s already illegal due to defamation laws, so really it’s just an extention of those combined with revenge porn laws.
The reason they have to include the type of tech in the law is because that tech made it possible for unskilled bad actors to get on it…therefore there’ll be more people committing these types of crimes against others. It’s a good thing they’re addressing this issue.