I'm not seeing the imposter side of things personally but maybe he does come across like the old addage : dumb people think they know everything, smart people know they know nothing. Or something to that effect.
Since you linked Wikipedia, I'll quote it.
> Nevertheless, low performers' self-assessment is lower than that of high performers.
> Among laypeople, the Dunning–Kruger effect is often misunderstood as the claim that people with low intelligence are more confident in their knowledge and skills than people with high intelligence.