Do you have children, nieces, nephews? No child is ever taught language by any method other than TPR. We'd never ask a child/baby to "get the ball" without having a ball present and a ball tossed. Yet teachers try to teach language without context or an expected physical response.
Total Physical Response
Theory of learning
Asher's language learning theories seem similar to those of other behavioral psychologists. There are three principles he elaborates;
* Second language learning is parallel to first language learning and should reflect the same naturalistic processes
* Listening should develop before speaking
* Children respond physically to spoken language, and adult learners learn better if they do that too
* Once listening comprehension has been developed, speech devlops naturally and effortlessly out of it.
* Adults should use right-brain motor activities, while the left hemisphere watches and learns
* Delaying speech reduces stress.
Your supervisor only said more. Language lessons should try to use as much real context as is possible, especially at the beginning of language. Where there is context, a ball thrown, a student, any student doesn't have to puzzle out so much. They can concentrate on the sounds; as was noted, listening comes first.
Think about it a bit and maybe we can all discuss it more.