Actual impostors don't have imposter syndrome because they are talented at the only thing that matters to them: Screwing over everyone else for personal gain. And they have a track record proving beyond a shadow of a doubt that they know exactly what they are doing in that regard.
Talented people get imposter syndrome in part because it's hard to find good metrics to be confident in when people around you say "It can't be done" and then don't believe you when you say "It can be done. I know because I've done it."
Talented people often find their limits by slamming into a metaphorical wall at 100 miles an hour because they have so often heard "You can't do that" when they could that actually hitting their limit is the only real test. But doing that comes at a psychological, emotional and sometimes social cost. It hurts like a bitch and not something you want to keep doing.
It's easy to steal from other people. It's hard to study something for years, contemplate how it works, find a way to benefit without shafting other people.
And if no one believes you, no one adopts your thing. If it doesn't get adopted, you have no proof you are right.
Etc.
It can be hard to do something original in the real world. Much easier to be a con artist and to feel confident you know exactly what you are doing because all the other fools bought your BS and people are still buying it.