The basic idea seems to be that the lecture becomes homework, and the exercises are done in class. Conceptually, it seems to make a lot of sense, as most of the good-quality questions are generated when putting the ideas into practice. It means a qualified teacher is there to respond to "homework" questions, which relieves the responsibility from parents, who are often not qualified at all.
I wouldn't read too much into a mathy kid who hates geometry based on a particular delivery mechanism, because I knew a lot of kids who loved math but hated geometry for no better reason than because it was geometry.
