My original post was stating that we have no firm idea what actually happened here. The statement that they could have even tried the poh technique, that was not my determination of what happened, just a slight possibility. We have no idea what the instructor knew, he may well have read the POH technique, we dont know. It may have been employed too late to effect recovery. There is no hard evidence at all apart from the flight path indicating a descent path consistant with the spin sequence and a failure to recover.