This makes sense to me and rings true to my own experience. I went to a bootcamp and the people that did the best were those with a good deal of prior experience, and thus able to digest the most information. Students coming with zero (or close to it) programming experience/effort didn't perform well.

I'm including myself in the "good deal of prior experience" group, I did fine in the class and in my subsequent jobs. My class even had students that had been web devs on less desirable stacks using the class to ramp up on rails and they did even better.