B73, I understand fully the implications of this PPL not being able to save himself if his pedals/TR got stuck. That is not my point!
None of us SHOULD ever introduce such exercises without a full brief.
In CAT land we also forget how to do these things. That's precisely what there is a requirement for Annual Flight Training, before checking.
I am sorry but any Instructor of mine who subjected any pilot to the situation H500 described himself, would be pulled and retrained himself as the core concepts of teaching and learning, allied to the very clear safety guidelines in training, are absent between the lines of H500s story.