This sounds like a good exercise - a more aggressive version of the "base-to-final turn stall" taught in Ex. 10 (2).
Most of the time the aircraft does not drop a wing in that exercise, and recovery is not a big deal - this gives the wrong impression. Perhaps it should be taught ensuring that a wing actually drops, if necessary by deliberate skidding, so the student can not only practice the correct recovery action (rudder to stop further yaw) but also "gets" that a stall in this turn is best avoided altogether...