That isn’t really correct.
Fear of observation is highly correlated with neuroticism. Creativity, on the other hand, is a component of openness which is highly correlated with intelligence. The most creative people are those who measure both high intelligence and low neuroticism, which simultaneously are the people least concerned by impacts of increased observation.
Furthermore, high trust social environments only contribute to the degree of disclosure, not creativity. In low trust social environments creative people remain equally creative but either do not openly expose their creative output or do so secretly for subversive purposes.
I teach at an art university for 8 years now. I would highly doubt that: The most creative people are those who measure both high intelligence and low neuroticism.
In my experience that isn't the complete picture. I have met highly creative people who are extremely (unhealthy so) concerned with what others think, yet go their own path anyways. It is true that creative people often tend to do things in a way that appears as if it is outside of the frame of normal parameters. But this isn't so simple either, because maybe it is context dependent. A punk musician may live in disregard of the aesthetical conventions of society, but they also may have a traded canon of styles and works their own subculture. So maybe that punk doesn't care what society thinks about them, but they may care about what other punks think.
My experience with hundreds of art students is that there is no correlation between how independent someone works and how creative their output is. There are many ways of producing interesting ideas and the lone (usually: male) genius being the only true way is by this point a well-refuted idea.
This feels like it's conflating a couple of different things.
Firstly, in the Big five model, which you seem to be referencing, openness and neuroticism are separate factors- Low neuroticism isn't correlated with high openness. Yes, since neuroticism is a negative trait, one would expect people low in neuroticism to do better than people who are high in neuroticism. This does not equate to "the most creative people" though.
Secondly, I'd push back that people low in neuroticism would be "least concerned by" surveillance. While strictly technically true, that's not a helpful framing, as it seemingly implies surveillance would have a negligible negative impact for people low in neuroticism. If that's what you're implying, I'd like to see references.
I'm not able to comment at all on the conclusing about "degree of disclosure" being moderated by trust level in social environment, especially how "creative people remain equally creative but do not openly expose their creative output". If true, this implies that trust in society doesn't impact primary (unshared) creative output at all- that's a very strong claim in my opinion. I'd very much like references on this.