Didn't this turn out a bit of a straw man? As far as I understand, she advocates an understanding of the concepts complemented by some appropriate type of repetition.

There is also a third concept: That of imagining. She speaks specifically of one equation in classical mechanics, which she played around with in her mind until it became second nature.

Of course, this is based on her experience. It appeals to me based on my own experience, yet it isn't a showcasing of scientific rigour within pedagogics.