The only thing I can think of is the dunning Kruger effect vs imposter syndrome but I don’t think they are accurate in this case.

Because Dunning Kruger is more like when you learn about something new and become overly confident about it while people who are expert in the area are more aware of the complexity of the topic and how much thet don’t know. Dunning Kruger is not necessarily about being dumb and arrogant, but more so a step in learning that tends to be a bit embarrassing in hindsight. I have definitely been there and I have had several students when they are close to graduating their degree act like they understand our industry better than I or my colleagues do. Which is okay because you probably need that confidence when you start out haha.

And imposter syndrome also doesn’t really fit with it either, as it’s more about feeling like a fraud in your field even if you probably aren’t.

There probably are much better terms to explain what you’re describing, but that’s the best I can come up with haha.