I think this is a pretty poor understanding of imposter syndrome. Imposter syndrome is the belief that your achievements were lucky, like "I scored an 800 on my SAT by random chance/because I'm a good test taker/etc, but this says nothing about my ability to do well in college." So then they believe they by luck got placed in the wrong class and don't deserve to be there. This is exacerbated by people treating them inconsistently, sometimes from direct discrimination, other times from unconscious bias. They feel a kind of survivor's guilt, that breeds shame, that breeds imposter syndrome.