As I understand it, this was removed from the syllabus years ago (c. '97) after a German pilot took 3 members of the "German CAA" up in an R44 to demonstrate low g and the recovery - and killed them all.
I know an instructor that claims to be the only one to survive a 'mast bump' in an R22 and that was because he started to demo the recovery just as the 'droop stops' hit the mast. He said it was as if the mast had been hit with a sledge hammer.
Low G demo is one thing - but if you go too far the recovery is just theory.